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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.
A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator : It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates.
Hermle manufactures mechanical mechanisms, battery operated mechanisms, accessories such as dial, pendulums, weight shells, and do-it-yourself clock kits as well as finished clocks. Hermle is a manufacturer that sells to the wholesale industry and operates in over 80 countries with offices in Germany and the United States , since 1977, as ...
The electric clock market grew rapidly in the 1930s, and Telechron's patented power interruption indicator gave his clocks an advantage over competing synchronous clocks, but by the 1950s battery-operated clocks that weren't dependent on the power grid took market share, and in the 1960s the quartz clock replaced synchronous clocks.
The most accurate pendulum clocks were controlled electrically. [166] The Shortt–Synchronome clock, an electrical driven pendulum clock designed in 1921, was the first clock to be a more accurate timekeeper than the Earth itself. [167] A succession of innovations and discoveries led to the invention of the modern quartz timer.
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)
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