The watch; its construction, its merits and defects, how to choose it, and how to use it (1860)
Piaget, Henry F · New York, Printed by C. Vinten for the author · leaf 21
Duplex Escapement, A chronometer watch is that which has the vibra-tion of the balance free, or detached from the influenceof the maintaining power, except at receiving its impulse and unlocking. … Chronometer Escapement. 13 Several escapements, such as the verge, the vergule,the rack lever, &c, had to be abandoned. My uncle,who was one of the most ingenious workmen in Switz-erland and London, and maker of musical watches andrepeaters of every kind, and with whom I worked fif-teen years,…
Clocks and watches
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