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 =================================================================== Picture taken from the book "The Way Things Work" Simon and Schuster, NewYork (1967), p.215, Fig.3 ------------------------------------------------------------------- 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 ... =================================================================== 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: ******************************************************************* © C.HAMANN http://public.BHT-Berlin.de/hamann 11/12/18 |