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An analysis of the lever escapement (1910)
Playtner, H. R. [from old catalog] · Chicago, Hazlitt & Walker · leaf 40
\n G Fig. 21. … © \ G --< Fig. 23. :o Fig. 22. English watches are met with having a cylindrical orround ruby pin. Such a pin should never be put into awatch. The law of the parallelogram of forces is completelyignored by using such a pin; the friction during the un-locking and impulse actions is too severe, as…Clocks and watches
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