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The fusee was a good mainspring compensator, but it was also expensive, difficult to adjust, and had other disadvantages: It was bulky and tall, and made pocket watches unfashionably thick. [14] If the mainspring broke and had to be replaced, a frequent occurrence with early mainsprings, the fusee had to be readjusted to the new spring.
Verge watches and clocks are sensitive to changes in the drive force; they slow down as the mainspring unwinds. [36] This is called lack of isochronism. It was much worse in verge and foliot clocks due to the lack of a balance spring, but is a problem in all verge movements.
A hunter-case pocket watch is a case with a spring-hinged circular metal lid or cover, that closes over the watch-dial and crystal, protecting them from dust, scratches and other damage or debris. The name originated from England where "fox hunting men found it convenient to be able to open their watch and read the time with one hand, while ...
Jacques-Frédéric Houriet (1743–1830), Swiss watchmaker, Le Locle, pocket watch, tourbillon. [1] Jules Jürgensen (1745–1811), Danish watchmaker and manufacturer, Le Locle, pocket watch, longcase clock. Peter Kinzing (1745–1816), German clockmaker and mechanic. Daniel Möllinger (1746–1794), German clockmaker, Heidelberg, city clock maker.
The verge was the only escapement used in clocks and watches for 350 years. In spring-driven clocks and watches, it required a fusee to even out the force of the mainspring. It was used in the first pendulum clocks for about 50 years after the pendulum clock was invented in 1656.
The great wheel attached to the base of this fusee transmits power to the rest of the movement. The fusee contains the maintaining power, a mechanism for keeping the H4 going while being wound. From Gould: [17] The escapement is a modification of the "verge" fitted to... the common watches of Harrison's day. But the modifications are extensive.
There is a fusee in the earliest surviving spring-driven clock, a chamber clock made for Philip the Good in c. 1430. [109] Leonardo da Vinci, who produced the earliest known drawings of a pendulum in 1493–1494, [110] illustrated a fusee in c. 1500, a quarter of a century after the coiled spring first appeared. [111] The so-called 'Henlein Watch'
In 1888 the Dueber Watch Case Company operating in Cincinnati from 1864 bought the Hampden Watch Company of New York, in operation since 1877. Dueber moved them both to Canton, Ohio, where Hampden used the Dueber cases until the companies merged in 1923. Pocket watch sales declined after World War I, and the business closed in 1927.
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