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In 1826, Thomas Jefferson requested that Simon Willard build a clock for the University of Virginia at Charlottesville. The clock was to be a turret one and would be placed into the university's rotunda. Jefferson provided all of the clock's plans and specifications. According to these plans, Willard precisely assembled all the clock's pieces.
By the 19th century, clock parts were beginning to be made in small factories, but the skilled work of designing, assembling, and adjusting the clock was still done by clockmaking shops. By the 20th century, interchangeable parts and standardized designs allowed the entire clock to be assembled in factories, and clockmakers specialized in ...
The backward motion of the escape wheel during part of the cycle, called recoil, is one of the disadvantages of the anchor escapement.It results in a temporary reversal of the entire wheel train back to the driving weight with each tick of the clock, causing extra wear in the wheel train, excessive wear to the gear teeth, and inaccuracy.
The following is a list of notable companies that produced, or currently produce clocks. Where known, the location of the company and the dates of clock manufacture follow the name. In some instances the "company" consisted of a single person.
The Waltham Watch Company, also known as the American Waltham Watch Co. and the American Watch Co., was a company that produced about 40 million watches, clocks, speedometers, compasses, time delay fuses, and other precision instruments in the United States of America between 1850 and 1957.
Eli Terry (1772–1852), American manufacturer and clockmaker, Connecticut, introduction of mass production to clock making. David Henri Grandjean (1774–1845), Swiss watchmaker, Le Locle, highly complicated pocket watch. John Bliss (1775–1857) American chronometer maker, New York, marine chronometer.