The Adjustment of a watch is the manipulation of the balance, its spring and staff for the purpose of improving the time-keeping qualities of a watch.
Three adjustments are usually employed for this purpose, viz: postions, isochronism and compensation. The fusee is a spiral grooved cone, used to equalize the power of the mainspring.
It is mostly found in 19th century and older watches, although some, if not the most accurate, mechanical Chronometers ever made employed a fusee movement including the famous Model 21 Hamilton ship's chronometer made in the 1940's Lever Set describes a watch that uses a lever to free the setting mechanism. After removing the bezel, and pulling the lever, the hands will swing free when the crown is turned.
I have created a crude animation to show you how the lever moves.
Grant was President of the United States and Conestoga wagons creaked their way along the Lancaster Turnpike, as citizens heeded the call of Horace Greely to "Go West." Another form of pioneer was building a factory in the pastoral community of Lancaster, Pennsylvania. American soldiers during World War I preferred the smaller size and convenience of the wristwatch to the "old-fashioned" pocket watches.
The Adams and Perry Watch Company was built right beside the turnpike. They brought skilled watchmakers to Lancaster and began production in 1875. This trend caused a major shift in American watch production, with a new emphasis on producing wristwatch models for both men and women.
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A pocket watch is designed for a person to carry in a pocket.
In that year, the Hamilton Watch Company came into existence as a result of yet another reorganization. Based on the super-reliable 992B with Elinvar hairspring and mono-metallic balance, the Mod 23 adds a chronograph mechanism, making it one of the most complicated watches produced by Hamilton.
The name, Hamilton, was selected to honor Andrew Hamilton, original owner of the Lancaster site on which the factory was situated. Hamilton has always been on the forefront of horological innovation.
The Lancaster Watch Company continued to suffer growing pains and was reorganized again in 1884, this time as the Keystone Standard Watch Company. The first Hamilton chronometers were delivered to the Navy in February 1942, and at their peak Hamilton was making 500 chronometers per month!
Nevertheless, the financial problems persisted until 1892. Hamilton Model 23 Military Chronograph was widely used during WWII as a navigator's "stop-watch".
Its founders possessed a good combination of skills: Mr. Like so many infant industries, Adams and Perry did not have enough capital to market their product. During World War II, Hamilton ramped-up production of several models of chronometer to meet the US Armed Forces (particularly the US Navy's) need for an extremely accurate timepiece which could be used for navigation at sea.