Date: 29/10/2019 15:12:02
From: dv
ID: 1454870
Subject: fire

How many of you could make a fire using materials found in the bush?

Follow-up question: what method would you choose if you had to?

Some popular ones:

Percussive using flint (or similar) and pyrites (or similar). One disadvantage is that suitable materials are not abundant everywhere.

Frictional methods include:

drill: basically rolling a stick inside a hole in a larger piece of wood, back and forth between the hands. A variant of this is the bow-drill, which involves using the string of a simple bow to work the drill.

saw: basically rubbing a stick longitudinally along a larger piece of wood. Sometimes a membrane or rope is used as the saw instead.

plough: a flatter stick is rubbed back and forth at an angle against another piece of wood. This was used in the movie Cast Away.

The frictional methods all involve readily available materials but are all hard work.

Reply Quote

Date: 29/10/2019 15:18:31
From: Dropbear
ID: 1454878
Subject: re: fire

I doubt most people could make the friction method work if their life depended on it .. it’s very difficult to do.

Reply Quote

Date: 29/10/2019 15:19:39
From: Michael V
ID: 1454879
Subject: re: fire

dv said:


How many of you could make a fire using materials found in the bush?

Follow-up question: what method would you choose if you had to?

Some popular ones:

Percussive using flint (or similar) and pyrites (or similar). One disadvantage is that suitable materials are not abundant everywhere.

Frictional methods include:

drill: basically rolling a stick inside a hole in a larger piece of wood, back and forth between the hands. A variant of this is the bow-drill, which involves using the string of a simple bow to work the drill.

saw: basically rubbing a stick longitudinally along a larger piece of wood. Sometimes a membrane or rope is used as the saw instead.

plough: a flatter stick is rubbed back and forth at an angle against another piece of wood. This was used in the movie Cast Away.

The frictional methods all involve readily available materials but are all hard work.

I’ve never made fire from bush materials, but the bow-drill would be my choice from that lot.

Reply Quote

Date: 29/10/2019 15:19:43
From: buffy
ID: 1454880
Subject: re: fire

Dropbear said:


I doubt most people could make the friction method work if their life depended on it .. it’s very difficult to do.

And if I remember correctly, you have to use a hard wood and a soft wood in the right way for it to happen.

Reply Quote

Date: 29/10/2019 15:20:02
From: Bubblecar
ID: 1454881
Subject: re: fire

I think I’d have to eat my roadkill raw.

Reply Quote

Date: 29/10/2019 15:20:05
From: Tamb
ID: 1454882
Subject: re: fire

Dropbear said:


I doubt most people could make the friction method work if their life depended on it .. it’s very difficult to do.


I certainly couldn’t.

Reply Quote

Date: 29/10/2019 15:21:38
From: party_pants
ID: 1454883
Subject: re: fire

Not me, and I’ve tried.

We had a challenge once at my sister’s bush block when she still had one. We were going to do a big bonfire. She offered a prize for anyone who could start the fire using only natural materials that were lying on the ground. Being a sandy place with no natural rock apart from limestone brought in for the driveway it was impossible. We tried making bows etc, but would have needed proper tools (or flint tools at least) to make them neatly into just the right shape. Couldn’t make a good enough bow just using bare hands, I had no pocket knife.

We had one hour and nobody managed to do it.

Reply Quote

Date: 29/10/2019 15:22:17
From: Bubblecar
ID: 1454884
Subject: re: fire

OTOH I might be able to collect some dry tinder and use my glasses to focus enough sun to get it smouldering.

Reply Quote

Date: 29/10/2019 15:23:37
From: Tamb
ID: 1454885
Subject: re: fire

buffy said:


Dropbear said:

I doubt most people could make the friction method work if their life depended on it .. it’s very difficult to do.

And if I remember correctly, you have to use a hard wood and a soft wood in the right way for it to happen.

The ignitable stuff is sometimes called punk wood. It’s very soft & part rotted, it can be pulled apart by hand.

Reply Quote

Date: 29/10/2019 15:24:28
From: buffy
ID: 1454887
Subject: re: fire

Tamb said:


buffy said:

Dropbear said:

I doubt most people could make the friction method work if their life depended on it .. it’s very difficult to do.

And if I remember correctly, you have to use a hard wood and a soft wood in the right way for it to happen.

The ignitable stuff is sometimes called punk wood. It’s very soft & part rotted, it can be pulled apart by hand.

So that is the bit on the ground? And you have to use a hard wood as the twirly one?

Reply Quote

Date: 29/10/2019 15:25:34
From: Peak Warming Man
ID: 1454889
Subject: re: fire

I’ve never tried it but I wouldn’t know where to start with the flint method.
So I’d probably die in a ditch of exposure surrounded with hardwood sticks and bits of softwood with little holes in them.

Reply Quote

Date: 29/10/2019 15:26:21
From: Bubblecar
ID: 1454890
Subject: re: fire

Bubblecar said:


OTOH I might be able to collect some dry tinder and use my glasses to focus enough sun to get it smouldering.

…a hip flask of whisky would help too.

Reply Quote

Date: 29/10/2019 15:29:02
From: Tamb
ID: 1454892
Subject: re: fire

buffy said:


Tamb said:

buffy said:

And if I remember correctly, you have to use a hard wood and a soft wood in the right way for it to happen.

The ignitable stuff is sometimes called punk wood. It’s very soft & part rotted, it can be pulled apart by hand.

So that is the bit on the ground? And you have to use a hard wood as the twirly one?

The fire I saw started at Tjapukai was a piece of hardwood with a indentation in it on the ground. The punk wood was placed in the indentation and a sharpened stick was used to make the friction.

Reply Quote

Date: 29/10/2019 15:30:00
From: PermeateFree
ID: 1454893
Subject: re: fire

Practice makes perfect. An experienced fire maker with sticks can make a fire within minutes. It looks so effortless and quick. There are many short YouTube videos to show you how.

Reply Quote

Date: 29/10/2019 15:31:44
From: buffy
ID: 1454894
Subject: re: fire

Tamb said:


buffy said:

Tamb said:

The ignitable stuff is sometimes called punk wood. It’s very soft & part rotted, it can be pulled apart by hand.

So that is the bit on the ground? And you have to use a hard wood as the twirly one?

The fire I saw started at Tjapukai was a piece of hardwood with a indentation in it on the ground. The punk wood was placed in the indentation and a sharpened stick was used to make the friction.

Oh, I see. The punk wood was like tinder. I think I’ve seen (on TV sometime) it done with bits of fine dry grass in that spot.

Reply Quote

Date: 29/10/2019 15:35:47
From: Tamb
ID: 1454897
Subject: re: fire

buffy said:


Tamb said:

buffy said:

So that is the bit on the ground? And you have to use a hard wood as the twirly one?

The fire I saw started at Tjapukai was a piece of hardwood with a indentation in it on the ground. The punk wood was placed in the indentation and a sharpened stick was used to make the friction.

Oh, I see. The punk wood was like tinder. I think I’ve seen (on TV sometime) it done with bits of fine dry grass in that spot.


Similar idea & function, yes. Fairly easy to find in the Aussie bush.

Reply Quote

Date: 29/10/2019 15:36:12
From: party_pants
ID: 1454898
Subject: re: fire

PermeateFree said:


Practice makes perfect. An experienced fire maker with sticks can make a fire within minutes. It looks so effortless and quick. There are many short YouTube videos to show you how.

I had a look at a few of those a while back. They all seem to use a pocket knife (or similar approved) to strip the bark and shape their sticks. Having access to some sort of woodworking tools is vital IME.

Reply Quote

Date: 29/10/2019 15:39:02
From: Dropbear
ID: 1454901
Subject: re: fire

to be fair though, many people struggle to build a fire with firelighters and bagged firewood … so a couple of fragile embers at the base of a worn out hole isn’t going to do much for them

Reply Quote

Date: 29/10/2019 15:39:27
From: PermeateFree
ID: 1454902
Subject: re: fire

party_pants said:


PermeateFree said:

Practice makes perfect. An experienced fire maker with sticks can make a fire within minutes. It looks so effortless and quick. There are many short YouTube videos to show you how.

I had a look at a few of those a while back. They all seem to use a pocket knife (or similar approved) to strip the bark and shape their sticks. Having access to some sort of woodworking tools is vital IME.

The stone-age was around for a lot longer than the iron-age. Plenty of chert or flint, etc., around to find.

Reply Quote

Date: 29/10/2019 15:41:38
From: party_pants
ID: 1454903
Subject: re: fire

PermeateFree said:


party_pants said:

PermeateFree said:

Practice makes perfect. An experienced fire maker with sticks can make a fire within minutes. It looks so effortless and quick. There are many short YouTube videos to show you how.

I had a look at a few of those a while back. They all seem to use a pocket knife (or similar approved) to strip the bark and shape their sticks. Having access to some sort of woodworking tools is vital IME.

The stone-age was around for a lot longer than the iron-age. Plenty of chert or flint, etc., around to find.

Yes. I think you would need to master the basics of stone tools (and where to find them) before you could master the bow-drill technique for making a fire.

Reply Quote

Date: 29/10/2019 15:43:58
From: PermeateFree
ID: 1454905
Subject: re: fire

party_pants said:


PermeateFree said:

party_pants said:

I had a look at a few of those a while back. They all seem to use a pocket knife (or similar approved) to strip the bark and shape their sticks. Having access to some sort of woodworking tools is vital IME.

The stone-age was around for a lot longer than the iron-age. Plenty of chert or flint, etc., around to find.

Yes. I think you would need to master the basics of stone tools (and where to find them) before you could master the bow-drill technique for making a fire.

Yes, knowledge and experience would be essential.

Reply Quote

Date: 29/10/2019 15:46:23
From: dv
ID: 1454906
Subject: re: fire

Bubblecar said:


OTOH I might be able to collect some dry tinder and use my glasses to focus enough sun to get it smouldering.

I couldn’t do that because my glasses correct myopia.

Reply Quote

Date: 29/10/2019 15:47:54
From: Peak Warming Man
ID: 1454908
Subject: re: fire

PermeateFree said:


party_pants said:

PermeateFree said:

The stone-age was around for a lot longer than the iron-age. Plenty of chert or flint, etc., around to find.

Yes. I think you would need to master the basics of stone tools (and where to find them) before you could master the bow-drill technique for making a fire.

Yes, knowledge and experience would be essential.

But Knowledge to their eyes her ample page
Rich with the spoils of time did ne’er unroll;
Chill Penury repress’d their noble rage,
And froze their nuts off.

Reply Quote

Date: 29/10/2019 15:49:49
From: Michael V
ID: 1454909
Subject: re: fire

party_pants said:


PermeateFree said:

party_pants said:

I had a look at a few of those a while back. They all seem to use a pocket knife (or similar approved) to strip the bark and shape their sticks. Having access to some sort of woodworking tools is vital IME.

The stone-age was around for a lot longer than the iron-age. Plenty of chert or flint, etc., around to find.

Yes. I think you would need to master the basics of stone tools (and where to find them) before you could master the bow-drill technique for making a fire.

That is something I can do. Make knapped edge stone tools.

Reply Quote

Date: 29/10/2019 15:53:19
From: Bubblecar
ID: 1454913
Subject: re: fire

dv said:


Bubblecar said:

OTOH I might be able to collect some dry tinder and use my glasses to focus enough sun to get it smouldering.

I couldn’t do that because my glasses correct myopia.

Same here. Maybe the lenses combined might work.

Reply Quote

Date: 29/10/2019 15:56:09
From: party_pants
ID: 1454914
Subject: re: fire

Michael V said:


party_pants said:

PermeateFree said:

The stone-age was around for a lot longer than the iron-age. Plenty of chert or flint, etc., around to find.

Yes. I think you would need to master the basics of stone tools (and where to find them) before you could master the bow-drill technique for making a fire.

That is something I can do. Make knapped edge stone tools.

Noted. I’m taking you with me next time I’m planning a place crash on a deserted island

:)

Reply Quote

Date: 29/10/2019 15:57:10
From: party_pants
ID: 1454915
Subject: re: fire

party_pants said:


Michael V said:

party_pants said:

Yes. I think you would need to master the basics of stone tools (and where to find them) before you could master the bow-drill technique for making a fire.

That is something I can do. Make knapped edge stone tools.

Noted. I’m taking you with me next time I’m planning a place crash on a deserted island

:)

plane

Reply Quote

Date: 29/10/2019 16:01:03
From: dv
ID: 1454917
Subject: re: fire

Bubblecar said:


dv said:

Bubblecar said:

OTOH I might be able to collect some dry tinder and use my glasses to focus enough sun to get it smouldering.

I couldn’t do that because my glasses correct myopia.

Same here. Maybe the lenses combined might work.

no

Reply Quote

Date: 29/10/2019 16:10:47
From: sarahs mum
ID: 1454918
Subject: re: fire

Does anyone want to borrow a lighter? there is a half dozen on the desk.

Reply Quote

Date: 29/10/2019 16:12:30
From: dv
ID: 1454919
Subject: re: fire

sarahs mum said:


Does anyone want to borrow a lighter? there is a half dozen on the desk.

Nah I’m good.

Reply Quote

Date: 29/10/2019 16:14:02
From: PermeateFree
ID: 1454920
Subject: re: fire

sarahs mum said:


Does anyone want to borrow a lighter? there is a half dozen on the desk.

You wouldn’t need a lighter if you were a chain smoker.

Reply Quote

Date: 29/10/2019 16:14:49
From: Bubblecar
ID: 1454922
Subject: re: fire

Anyway these days you could just borrow some flames from a nearby bushfire.

Reply Quote

Date: 29/10/2019 16:15:07
From: dv
ID: 1454923
Subject: re: fire

Bubblecar said:


Anyway these days you could just borrow some flames from a nearby bushfire.

Risky

Reply Quote

Date: 29/10/2019 16:18:42
From: Divine Angel
ID: 1454926
Subject: re: fire

Dropbear said:


I doubt most people could make the friction method work if their life depended on it .. it’s very difficult to do.

Yeah, have you ever watched Survivor?

Reply Quote

Date: 29/10/2019 16:33:45
From: dv
ID: 1454931
Subject: re: fire

Divine Angel said:


Dropbear said:

I doubt most people could make the friction method work if their life depended on it .. it’s very difficult to do.

Yeah, have you ever watched Survivor?

no

Reply Quote

Date: 29/10/2019 16:34:44
From: Tamb
ID: 1454933
Subject: re: fire

dv said:


sarahs mum said:

Does anyone want to borrow a lighter? there is a half dozen on the desk.

Nah I’m good.


The flint would be handy.

Reply Quote

Date: 29/10/2019 16:36:37
From: dv
ID: 1454935
Subject: re: fire

I only found out what an x-ray attack is because the chess.com analysis of my games showed that this was one of the weakest parts of my game: I only successfully effected an x-ray attack 22% of the time

Reply Quote

Date: 29/10/2019 16:37:57
From: party_pants
ID: 1454936
Subject: re: fire

dv said:


I only found out what an x-ray attack is because the chess.com analysis of my games showed that this was one of the weakest parts of my game: I only successfully effected an x-ray attack 22% of the time

Once you master this technique… the sky’s the limit

Reply Quote

Date: 29/10/2019 16:40:40
From: Tamb
ID: 1454939
Subject: re: fire

dv said:


Divine Angel said:

Dropbear said:

I doubt most people could make the friction method work if their life depended on it .. it’s very difficult to do.

Yeah, have you ever watched Survivor?

no


It’s not so difficult if you take your time preparing the tools. The horizontal wood needs to be long enough to put your foot on & the depression needs to be the right dimensions to cradle the tinder.
The hard part is having the stamina to keep the friction going. It’s better with two people.

Reply Quote

Date: 29/10/2019 16:43:51
From: dv
ID: 1454940
Subject: re: fire

Technically you could start a fire with an xray attack

Reply Quote

Date: 29/10/2019 16:46:21
From: Michael V
ID: 1454942
Subject: re: fire

party_pants said:


Michael V said:

party_pants said:

Yes. I think you would need to master the basics of stone tools (and where to find them) before you could master the bow-drill technique for making a fire.

That is something I can do. Make knapped edge stone tools.

Noted. I’m taking you with me next time I’m planning a plane crash on a deserted island

:)

Nup. I don’t want to be involved in a plane crash.

Reply Quote

Date: 29/10/2019 17:51:47
From: Divine Angel
ID: 1454957
Subject: re: fire

We didn’t start the fire. It was always burning since the world’s been turning.

Reply Quote

Date: 29/10/2019 17:53:15
From: Bogsnorkler
ID: 1454960
Subject: re: fire

Divine Angel said:


We didn’t start the fire. It was always burning since the world’s been turning.

it’s a good slave but a poor master.

old jungle saying.

Reply Quote

Date: 29/10/2019 20:34:12
From: Peak Warming Man
ID: 1455025
Subject: re: fire

So is there a way that does not involve the two traditional means of making fire.
If you were on a deserted island sitting down near the beach shucking oysters and eating coconut meat besides a pristine fresh water creek meandering into the sea and you thought, I wouldn’t mind cooking a fish for dinner.
Is there any plausible ingenious method to get a continuous self sustaining heat producing chemical reaction going?

Reply Quote

Date: 29/10/2019 20:47:15
From: mollwollfumble
ID: 1455047
Subject: re: fire

dv said:


How many of you could make a fire using materials found in the bush?

Follow-up question: what method would you choose if you had to?

Some popular ones:

Percussive using flint (or similar) and pyrites (or similar). One disadvantage is that suitable materials are not abundant everywhere.

Frictional methods include:

drill: basically rolling a stick inside a hole in a larger piece of wood, back and forth between the hands. A variant of this is the bow-drill, which involves using the string of a simple bow to work the drill.

saw: basically rubbing a stick longitudinally along a larger piece of wood. Sometimes a membrane or rope is used as the saw instead.

plough: a flatter stick is rubbed back and forth at an angle against another piece of wood. This was used in the movie Cast Away.

The frictional methods all involve readily available materials but are all hard work.

I’d use the Mongolian “smudge pot” myself. Wait for a fire to start elsewhere then carry it around in a small clay pot filled with moss. A bit heavy to lug around, but better in the cold and the wet.

Reply Quote

Date: 29/10/2019 20:48:02
From: Bogsnorkler
ID: 1455048
Subject: re: fire

fire piston.

Reply Quote

Date: 29/10/2019 20:48:57
From: PermeateFree
ID: 1455049
Subject: re: fire

Peak Warming Man said:


So is there a way that does not involve the two traditional means of making fire.
If you were on a deserted island sitting down near the beach shucking oysters and eating coconut meat besides a pristine fresh water creek meandering into the sea and you thought, I wouldn’t mind cooking a fish for dinner.
Is there any plausible ingenious method to get a continuous self sustaining heat producing chemical reaction going?

You should be able to light a fire from the coconuts and possibly a piece of the tree as an anvil.

Reply Quote

Date: 29/10/2019 20:53:36
From: party_pants
ID: 1455058
Subject: re: fire

Peak Warming Man said:


So is there a way that does not involve the two traditional means of making fire.
If you were on a deserted island sitting down near the beach shucking oysters and eating coconut meat besides a pristine fresh water creek meandering into the sea and you thought, I wouldn’t mind cooking a fish for dinner.
Is there any plausible ingenious method to get a continuous self sustaining heat producing chemical reaction going?

You could painstakingly grind a rock face into a parabola shape, and polish it smooth, so that when you add a little film of water it reflects enough sunlight into the focal point to ignite some dry coconut husk.

Reply Quote

Date: 29/10/2019 21:16:51
From: gaghalfrunt
ID: 1455072
Subject: re: fire

If you were a millennial you would probably have a fire lighting app for it.

Reply Quote

Date: 29/10/2019 21:17:59
From: The Rev Dodgson
ID: 1455074
Subject: re: fire

gaghalfrunt said:


If you were a millennial you would probably have a fire lighting app for it.

Samsung phone.

Reply Quote

Date: 29/10/2019 21:18:12
From: dv
ID: 1455075
Subject: re: fire

Peak Warming Man said:


So is there a way that does not involve the two traditional means of making fire.
If you were on a deserted island sitting down near the beach shucking oysters and eating coconut meat besides a pristine fresh water creek meandering into the sea and you thought, I wouldn’t mind cooking a fish for dinner.
Is there any plausible ingenious method to get a continuous self sustaining heat producing chemical reaction going?

I suppose it depends on what else is handy. On a small island you might be hard pressed to find anything flinty but you might have some coconut trees.

but if you don’t want to use flint or rubbin’ then another shot might be if you are lucky enough to be in the presence of naturally occuring materials that are going to react exothermically. If you are lucky enough to be near a saltpetre deposit and a sulfur deposit (again, not likely on a small island) then you can make a basic explosive that you can might be able to ignite by banging rocks.

Reply Quote

Date: 29/10/2019 21:19:50
From: party_pants
ID: 1455078
Subject: re: fire

gaghalfrunt said:


If you were a millennial you would probably have a fire lighting app for it.

short-circuit the battery and hope it catches fire, or beak it open and dunk the lithium in water.

Reply Quote

Date: 29/10/2019 21:21:18
From: Bogsnorkler
ID: 1455082
Subject: re: fire

party_pants said:


gaghalfrunt said:

If you were a millennial you would probably have a fire lighting app for it.

short-circuit the battery and hope it catches fire, or beak it open and dunk the lithium in water.

what if you don’t have a judge or a bird handy???

Reply Quote

Date: 29/10/2019 21:22:43
From: dv
ID: 1455085
Subject: re: fire

gaghalfrunt said:


If you were a millennial you would probably have a fire lighting app for it.

Do millennials use apps more than other people?

Reply Quote

Date: 29/10/2019 21:25:22
From: gaghalfrunt
ID: 1455087
Subject: re: fire

dv said:


gaghalfrunt said:

If you were a millennial you would probably have a fire lighting app for it.

Do millennials use apps more than other people?

Please dont ruin a good stereotype with logic.

Reply Quote

Date: 29/10/2019 21:29:09
From: buffy
ID: 1455090
Subject: re: fire

dv said:


gaghalfrunt said:

If you were a millennial you would probably have a fire lighting app for it.

Do millennials use apps more than other people?

Old people use programs.

Reply Quote

Date: 29/10/2019 21:30:22
From: The Rev Dodgson
ID: 1455092
Subject: re: fire

buffy said:


dv said:

gaghalfrunt said:

If you were a millennial you would probably have a fire lighting app for it.

Do millennials use apps more than other people?

Old people use programs.

Or in some cases, pen and paper.

Reply Quote

Date: 29/10/2019 21:33:45
From: buffy
ID: 1455095
Subject: re: fire

The Rev Dodgson said:


buffy said:

dv said:

Do millennials use apps more than other people?

Old people use programs.

Or in some cases, pen and paper.

Which can be surprisingly efficient in some circumstances…

Reply Quote

Date: 29/10/2019 21:37:20
From: dv
ID: 1455096
Subject: re: fire

You could probably use a pen and paper to start a fire.

Reply Quote

Date: 29/10/2019 21:38:02
From: The Rev Dodgson
ID: 1455097
Subject: re: fire

buffy said:


The Rev Dodgson said:

buffy said:

Old people use programs.

Or in some cases, pen and paper.

Which can be surprisingly efficient in some circumstances…

Like when completing your annual tax return, for instance.

Reply Quote

Date: 29/10/2019 21:39:01
From: The Rev Dodgson
ID: 1455098
Subject: re: fire

dv said:


You could probably use a pen and paper to start a fire.

We didn’t start the fire.

Reply Quote

Date: 29/10/2019 21:39:16
From: Witty Rejoinder
ID: 1455099
Subject: re: fire

The Rev Dodgson said:


buffy said:

The Rev Dodgson said:

Or in some cases, pen and paper.

Which can be surprisingly efficient in some circumstances…

Like when completing your annual tax return, for instance.

Not when you use mytax and most of the pertinent information is already there waiting for you.

Reply Quote

Date: 29/10/2019 21:42:10
From: The Rev Dodgson
ID: 1455100
Subject: re: fire

Witty Rejoinder said:


The Rev Dodgson said:

buffy said:

Which can be surprisingly efficient in some circumstances…

Like when completing your annual tax return, for instance.

Not when you use mytax and most of the pertinent information is already there waiting for you.

I’ve just completed my tax return on-line today, which was the reason for the comment.

Like many recent apps, the “simplification” just makes life difficult when what you want to do is not that simple.

Reply Quote

Date: 29/10/2019 21:49:44
From: btm
ID: 1455102
Subject: re: fire

You could mix iodine with aluminium filings and add a drop of water to the edge.
A magnifying glass would need to be at least 20cm in diameter to start a fire (so spectacle lenses won’t work.)
Mixing potassium permanganate and glycerin (or antifreeze, if you’ve got access to that) will cause the mixture to spontaneously combust, but it may take a few minutes.
If you’ve got access to an unfired bullet, you can remove the projectile and use the propelland to start a fire, though it’s not very safe.
Any of the hypergolic rocket fuel/oxider mixes would also work, but you might have trouble finding them (and handling them — they’re notoriously toxic.)

There are a few ideas for you.

Reply Quote

Date: 29/10/2019 21:51:19
From: dv
ID: 1455103
Subject: re: fire

dv said:


Bubblecar said:

dv said:

I couldn’t do that because my glasses correct myopia.

Same here. Maybe the lenses combined might work.

no

BUT

What if you filled the lens with water?

I think this would work best if:

*the lenses were pretty large and round *there was no correction for astigmatism (my glasses would not work alas) *the sun is high in the sky

This last is because obv, the lenses would have to be horizontal so the water didn’t leak, unless you want to make a kind of cup out of clay or something.

The sun doesn’t get high in the sky except in the Tropics and subtropics.

The point is that lenses that correct for myopia typically have an inner surface that is more curved than the outer: filling with water to a flat surface creates something akin to a lens that would focus the sun’s light to a point. Of course water has a different index of refraction from glass or optical plastics so I’ve no idea how well this would work in practice.

Reply Quote

Date: 29/10/2019 21:51:43
From: Bogsnorkler
ID: 1455104
Subject: re: fire

btm said:


You could mix iodine with aluminium filings and add a drop of water to the edge.
A magnifying glass would need to be at least 20cm in diameter to start a fire (so spectacle lenses won’t work.)
Mixing potassium permanganate and glycerin (or antifreeze, if you’ve got access to that) will cause the mixture to spontaneously combust, but it may take a few minutes.
If you’ve got access to an unfired bullet, you can remove the projectile and use the propelland to start a fire, though it’s not very safe.
Any of the hypergolic rocket fuel/oxider mixes would also work, but you might have trouble finding them (and handling them — they’re notoriously toxic.)

There are a few ideas for you.

great, all we have is a raw fish and some coconuts.

Reply Quote

Date: 29/10/2019 21:51:51
From: dv
ID: 1455105
Subject: re: fire

The Rev Dodgson said:


buffy said:

The Rev Dodgson said:

Or in some cases, pen and paper.

Which can be surprisingly efficient in some circumstances…

Like when completing your annual tax return, for instance.

Or you could just do it online in thirty seconds because most of the fields are already filled in…

Reply Quote

Date: 29/10/2019 21:52:12
From: Witty Rejoinder
ID: 1455106
Subject: re: fire

There’s always the tried and true brake-fluid and pool chlorine.

Reply Quote

Date: 29/10/2019 21:53:06
From: dv
ID: 1455107
Subject: re: fire

“A magnifying glass would need to be at least 20cm in diameter to start a fire (so spectacle lenses won’t work.)”

What?

No. I’ve personally started fires with hand lenses less than 10 cm across.

Reply Quote

Date: 29/10/2019 21:53:51
From: Bogsnorkler
ID: 1455108
Subject: re: fire

dv said:


dv said:

Bubblecar said:

Same here. Maybe the lenses combined might work.

no

BUT

What if you filled the lens with water?

I think this would work best if:

*the lenses were pretty large and round *there was no correction for astigmatism (my glasses would not work alas) *the sun is high in the sky

This last is because obv, the lenses would have to be horizontal so the water didn’t leak, unless you want to make a kind of cup out of clay or something.

The sun doesn’t get high in the sky except in the Tropics and subtropics.

The point is that lenses that correct for myopia typically have an inner surface that is more curved than the outer: filling with water to a flat surface creates something akin to a lens that would focus the sun’s light to a point. Of course water has a different index of refraction from glass or optical plastics so I’ve no idea how well this would work in practice.

you might need a layer of fresh water covered with a layer of saltwater and make an apochromatic lens.

Reply Quote

Date: 29/10/2019 21:54:34
From: dv
ID: 1455109
Subject: re: fire

Witty Rejoinder said:


There’s always the tried and true brake-fluid and pool chlorine.

If you’ve got access to these things you can probably get a box of matches or a cigarette lighter. We’ve been talking about how to start a fire without manufactured materials.

Reply Quote

Date: 29/10/2019 21:55:09
From: Witty Rejoinder
ID: 1455110
Subject: re: fire

dv said:


The Rev Dodgson said:

buffy said:

Which can be surprisingly efficient in some circumstances…

Like when completing your annual tax return, for instance.

Or you could just do it online in thirty seconds because most of the fields are already filled in…

Rev had millions in dividend imputation credits* to apply towards his meager pension so it wasn’t quite so simple.

*may not be true
Reply Quote

Date: 29/10/2019 21:56:05
From: Witty Rejoinder
ID: 1455111
Subject: re: fire

dv said:


Witty Rejoinder said:

There’s always the tried and true brake-fluid and pool chlorine.

If you’ve got access to these things you can probably get a box of matches or a cigarette lighter. We’ve been talking about how to start a fire without manufactured materials.

You’re no fun.

Reply Quote

Date: 29/10/2019 21:57:56
From: btm
ID: 1455112
Subject: re: fire

Bogsnorkler said:


btm said:

You could mix iodine with aluminium filings and add a drop of water to the edge.
A magnifying glass would need to be at least 20cm in diameter to start a fire (so spectacle lenses won’t work.)
Mixing potassium permanganate and glycerin (or antifreeze, if you’ve got access to that) will cause the mixture to spontaneously combust, but it may take a few minutes.
If you’ve got access to an unfired bullet, you can remove the projectile and use the propelland to start a fire, though it’s not very safe.
Any of the hypergolic rocket fuel/oxider mixes would also work, but you might have trouble finding them (and handling them — they’re notoriously toxic.)

There are a few ideas for you.

great, all we have is a raw fish and some coconuts.

You mean your coconuts aren’t filled with KMnO4 and glycerol? Shameful!
Both those compounds are extensively used in wound treatment, so you’d have them in your first aid kit.

Reply Quote

Date: 29/10/2019 21:58:16
From: party_pants
ID: 1455114
Subject: re: fire

btm said:

A magnifying glass would need to be at least 20cm in diameter to start a fire (so spectacle lenses won’t work.)

Nah, I’ve done it with an approx 70mm diameter glass.

Reply Quote

Date: 29/10/2019 21:58:52
From: dv
ID: 1455116
Subject: re: fire

dv said:


“A magnifying glass would need to be at least 20cm in diameter to start a fire (so spectacle lenses won’t work.)”

What?

No. I’ve personally started fires with hand lenses less than 10 cm across.

Here’s a video (one of many) of a shirtless man lighting a fire with reading glasses.
https://www.youtube.com/watch?v=P38dHE6FoDQ

Reply Quote

Date: 29/10/2019 22:00:09
From: SCIENCE
ID: 1455117
Subject: re: fire

Bogsnorkler said:


fire piston.

Reply Quote

Date: 29/10/2019 22:01:04
From: dv
ID: 1455119
Subject: re: fire

SCIENCE said:


Bogsnorkler said:

fire piston.

Do you think you could make one?

Reply Quote

Date: 29/10/2019 22:02:46
From: sibeen
ID: 1455120
Subject: re: fire

dv said:


dv said:

“A magnifying glass would need to be at least 20cm in diameter to start a fire (so spectacle lenses won’t work.)”

What?

No. I’ve personally started fires with hand lenses less than 10 cm across.

Here’s a video (one of many) of a shirtless man lighting a fire with reading glasses.
https://www.youtube.com/watch?v=P38dHE6FoDQ

Do you have to be shirtless? I mean I have the glasses but I would prefer to maintain a modicum of dignity.

Reply Quote

Date: 29/10/2019 22:03:40
From: btm
ID: 1455121
Subject: re: fire

dv said:


“A magnifying glass would need to be at least 20cm in diameter to start a fire (so spectacle lenses won’t work.)”

What?

No. I’ve personally started fires with hand lenses less than 10 cm across.

Looks like I’m wrong. This site: https://www.trueprepper.com/magnifying-glass-fire-starter/ claims that the best lens they used to get a fire started is only 1.8 inches diameter.

Reply Quote

Date: 29/10/2019 22:04:45
From: dv
ID: 1455123
Subject: re: fire

sibeen said:

Do you have to be shirtless? I mean I have the glasses but I would prefer to maintain a modicum of dignity.

I’m afraid so yes.

Reply Quote

Date: 29/10/2019 22:05:10
From: party_pants
ID: 1455124
Subject: re: fire

btm said:


dv said:

“A magnifying glass would need to be at least 20cm in diameter to start a fire (so spectacle lenses won’t work.)”

What?

No. I’ve personally started fires with hand lenses less than 10 cm across.

Looks like I’m wrong. This site: https://www.trueprepper.com/magnifying-glass-fire-starter/ claims that the best lens they used to get a fire started is only 1.8 inches diameter.

I got in trouble for it at school. I got a magnifying glass for my birthday and took it to school.

Reply Quote

Date: 29/10/2019 22:05:56
From: dv
ID: 1455125
Subject: re: fire

btm said:

Looks like I’m wrong.

respect

Reply Quote

Date: 29/10/2019 22:07:08
From: Peak Warming Man
ID: 1455126
Subject: re: fire

dv said:


sibeen said:

Do you have to be shirtless? I mean I have the glasses but I would prefer to maintain a modicum of dignity.

I’m afraid so yes.

LOL

Reply Quote

Date: 29/10/2019 22:07:18
From: Witty Rejoinder
ID: 1455127
Subject: re: fire

party_pants said:


btm said:

dv said:

“A magnifying glass would need to be at least 20cm in diameter to start a fire (so spectacle lenses won’t work.)”

What?

No. I’ve personally started fires with hand lenses less than 10 cm across.

Looks like I’m wrong. This site: https://www.trueprepper.com/magnifying-glass-fire-starter/ claims that the best lens they used to get a fire started is only 1.8 inches diameter.

I got in trouble for it at school. I got a magnifying glass for my birthday and took it to school.

Frying ants at big lunch?

Reply Quote

Date: 29/10/2019 22:07:45
From: The Rev Dodgson
ID: 1455128
Subject: re: fire

dv said:


The Rev Dodgson said:

buffy said:

Which can be surprisingly efficient in some circumstances…

Like when completing your annual tax return, for instance.

Or you could just do it online in thirty seconds because most of the fields are already filled in…

Except when the fields that are not filled in have no explanation of what they actually want, and the on-line assistant can’t help because they aren’t trained in that, and when you actually get to speak to someone they can’t tell you if that information is required or not, so what used to be a 30 second job takes most of the day.

Reply Quote

Date: 29/10/2019 22:09:16
From: party_pants
ID: 1455129
Subject: re: fire

Witty Rejoinder said:


party_pants said:

btm said:

Looks like I’m wrong. This site: https://www.trueprepper.com/magnifying-glass-fire-starter/ claims that the best lens they used to get a fire started is only 1.8 inches diameter.

I got in trouble for it at school. I got a magnifying glass for my birthday and took it to school.

Frying ants at big lunch?

Yeah, we got tired of that so decided to see if we could light a fire instead.

Reply Quote

Date: 29/10/2019 22:09:42
From: Witty Rejoinder
ID: 1455130
Subject: re: fire

dv said:


btm said:

Looks like I’m wrong.

respect

You’d be able to bask in a similar glory if you gave up on Corbyn.

Reply Quote

Date: 29/10/2019 22:14:03
From: Peak Warming Man
ID: 1455131
Subject: re: fire

party_pants said:


Witty Rejoinder said:

party_pants said:

I got in trouble for it at school. I got a magnifying glass for my birthday and took it to school.

Frying ants at big lunch?

Yeah, we got tired of that so decided to see if we could light a fire instead.

You see how suddenly it becomes plural, a subconscious attempt to spread the blame for the fire, for the total loss of K Wing.

Reply Quote

Date: 29/10/2019 22:15:09
From: sibeen
ID: 1455132
Subject: re: fire

Witty Rejoinder said:


dv said:

btm said:

Looks like I’m wrong.

respect

You’d be able to bask in a similar glory if you gave up on Corbyn.

https://www.theguardian.com/commentisfree/2019/oct/28/election-boris-johnson-tories-labour

No. no, it going to be all right. Polly reckons that even if Labour lose the Tories will then destroy themselves, leaving Corbyn to march to an inevitable victory in five years time.

Reply Quote

Date: 29/10/2019 22:15:15
From: party_pants
ID: 1455133
Subject: re: fire

Peak Warming Man said:


party_pants said:

Witty Rejoinder said:

Frying ants at big lunch?

Yeah, we got tired of that so decided to see if we could light a fire instead.

You see how suddenly it becomes plural, a subconscious attempt to spread the blame for the fire, for the total loss of K Wing.

I had friends at school.

Reply Quote

Date: 29/10/2019 22:17:13
From: Bogsnorkler
ID: 1455134
Subject: re: fire

party_pants said:


Peak Warming Man said:

party_pants said:

Yeah, we got tired of that so decided to see if we could light a fire instead.

You see how suddenly it becomes plural, a subconscious attempt to spread the blame for the fire, for the total loss of K Wing.

I had friends at school.

ladifuckingda

Reply Quote

Date: 29/10/2019 22:18:50
From: buffy
ID: 1455135
Subject: re: fire

dv said:


sibeen said:

Do you have to be shirtless? I mean I have the glasses but I would prefer to maintain a modicum of dignity.

I’m afraid so yes.

Only if you are going to YouTube it.

Reply Quote

Date: 29/10/2019 22:19:00
From: Witty Rejoinder
ID: 1455136
Subject: re: fire

party_pants said:


Peak Warming Man said:

party_pants said:

Yeah, we got tired of that so decided to see if we could light a fire instead.

You see how suddenly it becomes plural, a subconscious attempt to spread the blame for the fire, for the total loss of K Wing.

I had friends at school.

Loouxry

Reply Quote

Date: 29/10/2019 22:41:42
From: SCIENCE
ID: 1455143
Subject: re: fire

what is school

what is friends

Reply Quote

Date: 29/10/2019 22:51:25
From: dv
ID: 1455145
Subject: re: fire

SCIENCE said:


what is school

what is friends

SCIENCE asking the big questions.

Reply Quote

Date: 30/10/2019 08:07:19
From: Rule 303
ID: 1455157
Subject: re: fire

I’ve made fire by polishing the convex base of a Coke can and using it as a mirror. You often find them in the bush. Does that count?

Reply Quote

Date: 30/10/2019 08:11:52
From: Rule 303
ID: 1455158
Subject: re: fire

I’ve also made fire by dipping the corner of a rag in petrol and holding it next to an electric fence, with a screwdriver jumping to the rest of the fence, creating a spark.

Again… All things commonly found in the bush.

Reply Quote

Date: 30/10/2019 09:26:39
From: Rule 303
ID: 1455164
Subject: re: fire

Rule 303 said:


I’ve made fire by polishing the convex base of a Coke can and using it as a mirror. You often find them in the bush. Does that count?

Cave. Concave.

Can’t f’n believe I got that wrong.

;-/

Reply Quote

Date: 30/10/2019 09:33:24
From: Peak Warming Man
ID: 1455167
Subject: re: fire

Rule 303 said:


Rule 303 said:

I’ve made fire by polishing the convex base of a Coke can and using it as a mirror. You often find them in the bush. Does that count?

Cave. Concave.

Can’t f’n believe I got that wrong.

;-/

Too much polishing.

Reply Quote

Date: 30/10/2019 09:37:31
From: Bogsnorkler
ID: 1455169
Subject: re: fire

Peak Warming Man said:


Rule 303 said:

Rule 303 said:

I’ve made fire by polishing the convex base of a Coke can and using it as a mirror. You often find them in the bush. Does that count?

Cave. Concave.

Can’t f’n believe I got that wrong.

;-/

Too much polishing.

I was watching dobson polish telescope mirrors last evening. lot of work.

Reply Quote

Date: 30/10/2019 09:45:54
From: dv
ID: 1455170
Subject: re: fire

Rule 303 said:


I’ve made fire by polishing the convex base of a Coke can and using it as a mirror. You often find them in the bush. Does that count?

I mean you could find a cigarette lighter in the bush but I think it is clear enough that’s not the kind of thing I mean…

But I’m impressed that you managed to do that.

Reply Quote

Date: 30/10/2019 09:56:17
From: furious
ID: 1455174
Subject: re: fire

Not being experienced in such things, I had a look into it and I was surprised to find many “survivalists” talking about relying on things they find off the land and specifically mentioning starting fires the “stone age” way. They then go on to describe starting a fire which invariably requires the use of a metal knife.

I did find one where they used quartz as the striking stone and a softer stone as the one being struck. I’ve been to places where there is plenty of quartz lying around so that might be an option. I am unsure of the material of the “softer” rock because I only really skimmed over it and the page was formatted terribly. I think maybe their web designer was from the stone age…

Reply Quote

Date: 30/10/2019 10:01:21
From: Arts
ID: 1455184
Subject: re: fire

I just wait for a fire breathing dragon or, like, Ghost Rider to come along.

Reply Quote

Date: 30/10/2019 10:03:59
From: furious
ID: 1455186
Subject: re: fire

Arts said:


I just wait for a fire breathing dragon or, like, Ghost Rider to come along.

Or this bloke:

Reply Quote

Date: 30/10/2019 10:07:55
From: sibeen
ID: 1455189
Subject: re: fire

furious said:


Arts said:

I just wait for a fire breathing dragon or, like, Ghost Rider to come along.

Or this bloke:


He’s dead.

Reply Quote

Date: 30/10/2019 10:08:51
From: furious
ID: 1455190
Subject: re: fire

sibeen said:


furious said:

Arts said:

I just wait for a fire breathing dragon or, like, Ghost Rider to come along.

Or this bloke:


He’s dead.

So is Ghost Rider…

Reply Quote

Date: 30/10/2019 10:16:42
From: Arts
ID: 1455191
Subject: re: fire

furious said:


sibeen said:

furious said:

Or this bloke:


He’s dead.

So is Ghost Rider…

ok, so we still have the fire breathing dragons…

Reply Quote

Date: 30/10/2019 10:20:45
From: Tamb
ID: 1455192
Subject: re: fire

Arts said:


furious said:

sibeen said:

He’s dead.

So is Ghost Rider…

ok, so we still have the fire breathing dragons…

My Kraken doesn’t like them. They give her heartburn.

Reply Quote