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Thread: solar powered pocket watch
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28th April 2007, 07:07 PM #1
Why is it so?
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solar powered pocket watch
Well not quite but it works off the sun and fits in a pocket
It was a fun thing to make the hardest bit was finding the compass.
It works well enough for a retiree as time is not as critical ...within the halt hour is good enough if it needs more than a day or 2 accuracy
PeteWhat this country needs are more unemployed politicians.
Edward Langley, Artist (1928-1995)
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28th April 2007 07:07 PM # ADSGoogle Adsense Advertisement
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28th April 2007, 07:10 PM #2
Registered
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Thats so cool, and by the last pic its 5 o'clock.
Al
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28th April 2007, 07:43 PM #3
1/16"
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Ok, very neat but how does it all work.
Give us the scientific explanations of orientation to the sun and latitudes etc.Don't force it, use a bigger hammer.
Timber is what you use. Wood is what you burn.
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28th April 2007, 10:29 PM #4
Why is it so?
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Its set for the southern hemisphere and the latitude is set by the user to the nearest to them. Point the compass north and read off the time then Robert is you mothers brother
Originally Posted by rat52
PeteWhat this country needs are more unemployed politicians.
Edward Langley, Artist (1928-1995)
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28th April 2007, 10:31 PM #5
Why is it so?
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nope that was the flash Originally Posted by ozwinner
Thats so cool, and by the last pic its 5 o'clock.
Al but shows it works
PeteWhat this country needs are more unemployed politicians.
Edward Langley, Artist (1928-1995)
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28th April 2007, 10:37 PM #6
Dances with splinters
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[Peers out window, checks shadows of street-lamps] It looks like your flash is running late, mate.
- Andy Mc
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29th April 2007, 12:10 AM #7
1/16"
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Originally Posted by fxst
Its set for the southern hemisphere and the latitude is set by the user to the nearest to them. Point the compass north and read off the time then Robert is you mothers brother
Pete
So simple when it is explained.
Does the rod have to be of a certain length to set the angle of the dial.
Last question, where did you find the design or did you work it all out yourself.Don't force it, use a bigger hammer.
Timber is what you use. Wood is what you burn.
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29th April 2007, 12:55 AM #8
Why is it so?
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The gnomon (rod) is a specific size (offhand not sure 3.something inches) Originally Posted by rat52
The design is in the issue 27 of ScrollsawWoodworking & Crafts (US mag)
should be in newsagents about now. I subscribe so cant give a particular newsagent
PeteWhat this country needs are more unemployed politicians.
Edward Langley, Artist (1928-1995)
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2nd May 2007, 07:07 PM #9
Dehydrated Hydrographer
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Very cool!
The latitude scale would need to be calculated based on the distance from the hinge to the hole that the gnomon goes through. e.g the distance from the hinge to the 25 deg mark would be the distance from the hinge to the hole divided by sin 25 deg.
so if the distance from the hing to the hole was 50mm, the distance to the 25 deg mark would be 50/sin 25 = 50/0.4226 = 118.3. The same calculation will give you the other distances.
If you wanted to be really flash, you could find a correction graph for the equation of time and draw that on the dial to make it more accurate.
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