Thibaud
At 21:20 09-01-2004, you wrote:
I'll start by pointing out that I have absolutely no experience with something like this.
I have a question for those on this list with more experience (just about anyone!):
What would happen if a mirror were used not to reflect the sun's image, but as the dial itself?
As a kid, I had a mirror with an engraving of a deer on it in my room. I used to like to play with a flashlight at night by shining it on the mirror. The engraved image would become enlarged on the cieling, the opposite wall, etc.
Could a mirror sundial with attached gnomon be placed on the owner's south facing wall or roof in such a way that the reflection would be on the neighbor's wall throughout the year? (Very similar to reflecting dials that reflect onto bedroom ceilings.) The image would change shape throughout the day and throughout the year I think, but would still be readable. Or would the mirror dial have to be humongous to do this?
AF
Edley McKnight <[EMAIL PROTECTED]> wrote:
- All:
- A simpler idea might be to just use a video camera with a fisheye
- lens. Maybe on top of a flagpole on top of the roof.
- Edley.
- Date sent: Thu, 08 Jan 2004 21:35:15 -0800
- From: Tom Egan
- To: [email protected]
- Subject: Re: Sundial inside a room, but room is inside a
- canyon!
- Send reply to: [email protected]
- > All:
- >
- > Yet another possibility, a back-to-basics one: When I told my neighbor
- > that his north wall is now known around the globe, thanks to the Dialist
- > Board, he announced that demolishing his second story was now an
- > option. With a hearty chuckle, he said, "For the right price." I
- > thanked him for his concession, but shall continue to pursue lower-cost
- > options to bring the sun into my first-story room.
- >
- > S! eriously, I appreciate the thoughtfulness of all your comments. I've
- > learned a lot and enjoyed myself at the same time!
- >
- > Tom Egan
- >
- > tony moss wrote:
- >
- > >Fellow Shadow Watchers,
- > > Why not have an electro-mechanical 'sun tracker'
- > >on the roof with an electro-mechanical 'repeater' in the room which could
- > >be placed on a wall for easy reading. This could take the shape of a
- > >'hour hand' on a 'dial' with a 1:24 gearing to drive a concentric hand to
- > >show minutes. A simple ambient sunshine detector would switch off the
- > >tracker when the sun was obscured with a warning light on the dial to
- > >indicate this. When the sun re-appearerd the tracker could then switch
- > >to 'search' mode to relocate it thus avoiding frantic spuirious
- > >indications below.
- > >
- > >Digital clocks are cheaper of course but making it work would ! be a lot of
- > >fun ;-)
- > >
- > >Tony Moss.
- > >-
- > >
- > >
- > >
- >
- >
- > -
- -
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Thibaud Taudin-Chabot
52° 18' 19.85" North, 04° 51' 09.45" East, alt. -4.50 m
home email: [EMAIL PROTECTED]
