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In 1972, just two years after acquiring Chelsea Clock, Automation sold it to Bunker Ramo Corporation who, among many things, was the nation's largest producer of automotive clocks. In 1975, Chelsea began marketing its Ship's Bell and house strike (12-hour chime) movements with pendulum escapements in the popular banjo style. That same year, it ...
The following is a list of American companies that produced, or currently produce clocks. Where known, the location of the company and the dates of clock manufacture follow the name. Samuel Abbott; Montpelier, Vermont (1830–1861) Ansonia Clock Company; Ansonia, Connecticut and Brooklyn, New York (1851–1929)
In 1848, Negus and his brother John D. Negus founded the firm of T.S. & J.D. Negus, which manufactured and sold maritime chronometers and nautical instruments at 140 Water Street, New York City near the East River. The firm made chronometers for the United States Navy as well as shipmasters and yachtsmen. Their instruments were among the best ...
A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation.It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.
These boxes were planted into a thick bed of sawdust laid in partitioned shelves, like open-top boxes, one partition for each chronometer. The whole assembly was placed in a small, dedicated cabin low down in the ship as near as possible to the ship's centre of motion. Most of the chronometers remained in this cabin throughout the entire trip.
John Harrison (3 April [O.S. 24 March] 1693 – 24 March 1776) was an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of how to calculate longitude while at sea.