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in this clock, the minute hand stays still,
and the face of the clock moves behind
it.
the hour hand would have to move
backwards, almost as fast as the face.
ergo, at any given time that you look at
the clock, it will be accurate, but may
appear on its side or upside-down.
The Rollerzone Clock
http://www.artshape...igns/version24.html
[FarmerJohn, Feb 18 2005]
[link]
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have numbers be on swiveled blocks and weighted....then have each hand have a rectangular magnifying lense (maybe a greenish color?) at the end, with the hand extending somewhat under it that way you would just have to locate the hour lense... |
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you just said the hands don't move, then you say the hour hand would have to move backwards. which is it? |
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also the minute would have to move. this idea need a little more work. |
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I don't see why the hour hand has to go backwards. doesn't a complete revolution by the minute hand move the hour hand? I'd buy one! |
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there, is that better? the minute hand
doesn't move at all. it always remains
vertical [although you could put it at
any angle you please]. the numbers
move counter-clockwise behind it. since
the hour hand and the minute hand
move at different rates, one of them has
to move relative to the clock face. |
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I think you mean that you take an ordinary clock and rotate it anticlockwise at 1/60rpm so that the minute hand appears still. Bun. |
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po, the hour hand would also have to move anti(counter)clockwise with a sort of sidereal motion, moving back 11/12ths of the circumference with each complete face rotation, in order for it to be oriented correctly to the minute hand on any given glance. |
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Let's say the minute hand is pointing straight up. At 12:00 the clock will look normal, with both hands pointing to the #12 which is in its normal topmost location. By 12:15 the face will have rotated a quarter turn counterclockwise, moving the 12 to the normal 9 o'clock position. The 3 will now be at the topmost spot, where the minute hand is still pointing. The hour hand will have had to move backwards almost evenly with the clockface, but just a little slower, so that the hour hand is about a quarter of the way moved toward the 1 (which is now at the 10 o'clock spot). Likewise at 12:30, the 12 will be at the bottom but the hour hand will need to be positioned halfway between the 12 and 1 (which is now where the 7 is usually). The clock will essentially be completely upside down at this point. |
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So you see the hour hand needs to move anticounterclockwise too, but slightly slower than the face. The motion of a second hand would not change, I believe. |
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//the numbers move counter-clockwise behind it. since the hour hand and the minute hand move at different rates, one of them has to move relative to the clock face.// light is beginning to dawn! |
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I have a dumb question: which direction is anticounterclockwise? |
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You're right, that is a dumb question. |
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