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I used PovRay, a free tool to create 3D graphic images to construct a
model, based on the pictures and videos on the web. One could have
used Google's SketchUp free program which would have been easier to learn,
but not as good at rendering and moving pieces around. So here is
the basic model. |
The two large wheels show the time (although I
omitted the hour hand and minute marker). Note the (left) hour
pulley wheel goes counter clockwise as the weight descends!
The Minute gear tries to turn as the weight descends, but is governed
by the gear train that engages with the cyan Crown wheel.
This Crown wheel applies an impulse to the Verge (vertical rod) which
spins around its axis, releasing the wheel until it contacts a second
pallet arm. The pallet arms line up with the pins on the Crown wheel
and are attached to the verge.
The time it takes for the verge to rotate is controlled by the Foliot,
in this case a crescent at the top of the verge and a bar at the
bottom (an addition by the one built by John Hilgenberg in Perspex to
allow more accurate adjustment).One can then move around the model
and explode it to see how things fit together.
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One can, of course, change the colours and also the scale of any
piece. |
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