ttached to thebearing for the week cylinder (not shown) is one revolu-tion of a screw track, or worm, surrounding the arbor forthe hand. Attached to the arbor is a finger, O, held tautby a spring and engaging the track, P. The revolution ofthe arbor raises O on P until it slips off, when O,… … Fig. 115. The weeks chaage gear. THE MODERN CLOCK. 3.^^ Fig. 115 shows the inner end of the cyHnder for the daysof the week. There are two sets of these and fourteenteeth on the sprocket, R, so as to get the two cyHnders ap-proximately the same size (there being 14 days and 12months on the…
Clocks and watches
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