A)  H O W   T H E   D R I V I N G   O F   A   W A T C H   W O R K S
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         Picture taken from the book "The Way Things Work"
         Simon and Schuster, NewYork (1967), p.215, Fig.3
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The "driving force" of the watch is the MAINSPRING ( with its gears
not shown in detail here !) to move the hands as we know it -  BUT:
There must be  "periodic stops"  in between,  otherwise hands would
run in full speed ... until the tension of the spring is exhausted.
Stopping is done with a circular pendulum (= BALANCE + HAIRSPRING )
moving a PIN back and forth.  The PIN moves a LEVER back and forth.
On the end of the LEVER are PALLETS, gripping in the ESCAPE WHEEL's
teeth to "periodic stops". This makes the "TICK-TACK-TICK-TACK ..."
The shape of the  two PALLETS  and the shape of the  ESCAPE WHEEL's
teeth has to be tuned so, that the BALANCE get a "push at the right
time" on its PIN to continue swinging.

This principle is also valid for bigger CLOCKS (e.g. SETH-THOMAS ).

B)  HOW THIS PRINCIPLE APPLIES TO  A   P E N D U L U M   CLOCK  ...
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Instead a "Circular Pendulum", a LINEAR PENDULUM does the same job:
Its PIN moves the LEVER with its PALLET-PAIR ...

    LEARN MORE: Look at the REPAIR OF A SESSIONS MANTEL CLOCK ...

... and the "Driving Force" may be A WEIGHT ON A CHAIN ...
                       (e.g. HERMLE "OPEN IRON HOUSE" WALL CLOCK ).
impressum:
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© C.HAMANN       http://public.BHT-Berlin.de/hamann        11/12/18