I was thinking about making a sun dial.
I’m looking for a design that reflects the time from outside to inside on a wall or ceiling.
Could this be done using water or glass or mirrors?
Also a design for a sundial that collects sunlight from the roof and displays the time through a skylight onto a sundial on the ceiling.
Tau.Neutrino said:
I was thinking about making a sun dial.I’m looking for a design that reflects the time from outside to inside on a wall or ceiling.
Could this be done using water or glass or mirrors?
Some Sundials.
Pinterest – Devices used to measure time
Also a design for a sundial that collects sunlight from the roof and displays the time through a skylight onto a sundial on the ceiling.
Off topic, but first image on first link above. Is this true, did Al Gore really predict this? I really do need to start a list of doomsday predictions that have passed their “use by” date.
Back to topic. Do you have a particular design in mind to copy? Or are you looking for a design that has never been seen before?
The weirdest working sundial I know is this one.
https://apod.nasa.gov/apod/ap170621.html
This is the sundial on the Campus Centre at Monash university. It uses the analemma to get the correct time of day for every day of the year.
I think you’re going to have to post a sketch, because I can’t quite figure out how you want to set this up.
The simplest sundial I know of to bring the time indoors would be a camera obscura. Put a small hole (skylight) in the roof about 5 mm in diameter and paint on the floor (or wall) lines representing time of day and day of year. As the sun shines on a particular spot on the floor you can read off the time. This is actually a calendar as well as a clock. Somewhat more practical than painting the floor is to have a suspended translucent sheet (glass or plastic) with the lines marked on it in black paint. By looking from below (or above, or in a mirror) you can read off the time.
Another thought along the same lines to improve it would be to replace the small (5 mm) hole with a larger weakly focusing convex lens, say 5 cm in diameter with a focal length of about 2 metres (= 0.5 dioptre). You don’t want the focus to be too accurate or it could burn your house down. Like this but without the mirror at the top.
PS. I am convinced that “Cleopatra’s Needle” which was erected in the Egyptian city of Heliopolis around 1450 BC and moved to London in 1877 was actually originally a very accurate sundial.
mollwollfumble said:
Tau.Neutrino said:
I was thinking about making a sun dial.I’m looking for a design that reflects the time from outside to inside on a wall or ceiling.
Could this be done using water or glass or mirrors?
Some Sundials.
Pinterest – Devices used to measure time
Also a design for a sundial that collects sunlight from the roof and displays the time through a skylight onto a sundial on the ceiling.
Off topic, but first image on first link above. Is this true, did Al Gore really predict this? I really do need to start a list of doomsday predictions that have passed their “use by” date.
Back to topic. Do you have a particular design in mind to copy? Or are you looking for a design that has never been seen before?
The weirdest working sundial I know is this one.
https://apod.nasa.gov/apod/ap170621.html
This is the sundial on the Campus Centre at Monash university. It uses the analemma to get the correct time of day for every day of the year.
I think you’re going to have to post a sketch, because I can’t quite figure out how you want to set this up.
The simplest sundial I know of to bring the time indoors would be a camera obscura. Put a small hole (skylight) in the roof about 5 mm in diameter and paint on the floor (or wall) lines representing time of day and day of year. As the sun shines on a particular spot on the floor you can read off the time. This is actually a calendar as well as a clock. Somewhat more practical than painting the floor is to have a suspended translucent sheet (glass or plastic) with the lines marked on it in black paint. By looking from below (or above, or in a mirror) you can read off the time.
Another thought along the same lines to improve it would be to replace the small (5 mm) hole with a larger weakly focusing convex lens, say 5 cm in diameter with a focal length of about 2 metres (= 0.5 dioptre). You don’t want the focus to be too accurate or it could burn your house down. Like this but without the mirror at the top.
PS. I am convinced that “Cleopatra’s Needle” which was erected in the Egyptian city of Heliopolis around 1450 BC and moved to London in 1877 was actually originally a very accurate sundial.
Mollwoll, did you ever meet a man by the name of Teddy Trickett?
mollwollfumble said:
I think you’re going to have to post a sketch, because I can’t quite figure out how you want to set this up.
The simplest sundial I know of to bring the time indoors would be a camera obscura. Put a small hole (skylight) in the roof about 5 mm in diameter and paint on the floor (or wall) lines representing time of day and day of year. As the sun shines on a particular spot on the floor you can read off the time. This is actually a calendar as well as a clock. Somewhat more practical than painting the floor is to have a suspended translucent sheet (glass or plastic) with the lines marked on it in black paint. By looking from below (or above, or in a mirror) you can read off the time.
Another thought along the same lines to improve it would be to replace the small (5 mm) hole with a larger weakly focusing convex lens, say 5 cm in diameter with a focal length of about 2 metres (= 0.5 dioptre). You don’t want the focus to be too accurate or it could burn your house down. Like this but without the mirror at the top.
In a 60s kid show, Stranger on the Shore, they found a camera obscura in the house they were in.
roughbarked said:
Mollwoll, did you ever meet a man by the name of Teddy Trickett?
No, though that sounds like a “mollwollfumble” style of name. Checks web.
“A Teddy Trickett also lives nearby, he was a scientist with the C.S.I.R.O.”
Perhaps EJ Trickett? Author of numerous articles about “Social environment of junior high and high school classrooms”. No, that’s Edison J Trickett from the University of Maryland, USA.
Perhaps ES Trickett? Author of papers about pyranometers and psychrometers and “Measurement And Simulation Of Seasonal Fluctuations In Climate” in 1970. That was way before my time.
Ah, wait,
“An improved pyranometer”
Author D.Proctor
CSIRO Division of Energy Technology, Highett, Victoria, Australia 3190
Author E.S.Trickett
CSIRO Division of Irrigation Research, Griffith, New South Wales, Australia 2680
I do know David Proctor, very well as it happens. The CSIRO Division of Energy Technology merged with the CSIRO Division of Building and Construction. And I was moved from the Building and Construction side of the Division into the Energy Technology side of the Division some four years after I joined.
My work on Measurement And Simulation Of Seasonal Fluctuations In Climate – yes I have done some work on that – was both before and after I switched sides.
Why do you ask?
mollwollfumble said:
roughbarked said:
Mollwoll, did you ever meet a man by the name of Teddy Trickett?
No, though that sounds like a “mollwollfumble” style of name. Checks web.
“A Teddy Trickett also lives nearby, he was a scientist with the C.S.I.R.O.”
Perhaps EJ Trickett? Author of numerous articles about “Social environment of junior high and high school classrooms”. No, that’s Edison J Trickett from the University of Maryland, USA.
Perhaps ES Trickett? Author of papers about pyranometers and psychrometers and “Measurement And Simulation Of Seasonal Fluctuations In Climate” in 1970. That was way before my time.
Ah, wait,
“An improved pyranometer”
Author D.Proctor
CSIRO Division of Energy Technology, Highett, Victoria, Australia 3190
Author E.S.Trickett
CSIRO Division of Irrigation Research, Griffith, New South Wales, Australia 2680I do know David Proctor, very well as it happens. The CSIRO Division of Energy Technology merged with the CSIRO Division of Building and Construction. And I was moved from the Building and Construction side of the Division into the Energy Technology side of the Division some four years after I joined.
My work on Measurement And Simulation Of Seasonal Fluctuations In Climate – yes I have done some work on that – was both before and after I switched sides.
Why do you ask?
Teddy was at the C.S.I.R.O. as you have noted and he had built a device to beam the time from a sundial to his office.
roughbarked said:
mollwollfumble said:
roughbarked said:
Mollwoll, did you ever meet a man by the name of Teddy Trickett?
No, though that sounds like a “mollwollfumble” style of name. Checks web.
“A Teddy Trickett also lives nearby, he was a scientist with the C.S.I.R.O.”
Perhaps EJ Trickett? Author of numerous articles about “Social environment of junior high and high school classrooms”. No, that’s Edison J Trickett from the University of Maryland, USA.
Perhaps ES Trickett? Author of papers about pyranometers and psychrometers and “Measurement And Simulation Of Seasonal Fluctuations In Climate” in 1970. That was way before my time.
Ah, wait,
“An improved pyranometer”
Author D.Proctor
CSIRO Division of Energy Technology, Highett, Victoria, Australia 3190
Author E.S.Trickett
CSIRO Division of Irrigation Research, Griffith, New South Wales, Australia 2680I do know David Proctor, very well as it happens. The CSIRO Division of Energy Technology merged with the CSIRO Division of Building and Construction. And I was moved from the Building and Construction side of the Division into the Energy Technology side of the Division some four years after I joined.
My work on Measurement And Simulation Of Seasonal Fluctuations In Climate – yes I have done some work on that – was both before and after I switched sides.
Why do you ask?
Teddy was at the C.S.I.R.O. as you have noted and he had built a device to beam the time from a sundial to his office.
or at least that’s what I was told it was. Can’t ask him anymore because he has long since passed away. He was an Edward. It was tricky because his wife was Theodora.
ok, I’ll work on a sketch.