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An electric clock is a clock that is powered by electricity, as opposed to a mechanical clock which is powered by a hanging weight or a mainspring. The term is often applied to the electrically powered mechanical clocks that were used before quartz clocks were introduced in the 1980s.
To mark different hours, differently scented incenses (made from different recipes) were used. [54] The incense sticks used could be straight or spiralled; the spiralled ones were intended for long periods of use, and often hung from the roofs of homes and temples. [55] Some clocks were designed to drop weights at even intervals. [50]
The electric clock was patented in 1840, and electronic clocks were introduced in the 20th century, becoming widespread with the development of small battery-powered semiconductor devices. The timekeeping element in every modern clock is a harmonic oscillator, a physical object that vibrates or oscillates at a particular frequency. [2]
Thus, Telechron clocks are often considered genuine pieces of art—but art affordable by all, as thousands of them were made. The company employed some of the finest designers of the time, such as Leo Ivan Bruce (1911–1973) and John P. Rainbault. In the evolution of their designs, Telechron clocks were a faithful mirror of their own time.
The Standard Electric Time Company was a Springfield, Massachusetts company founded in 1884, and was a manufacturer of synchronized clock systems and fire alarm systems. They were the oldest manufacturer of electric clocks in the United States. The company was acquired by Johnson Controls in 1970 and then Faraday in 1978.
Eardley Norton, a most highly esteemed member of the Clockmakers' Company, was working between 1762 and 1794. There are clocks by him in the Royal Collection and many museums worldwide. Norton made an astronomical clock for George III which still stands in Buckingham Palace.
The Sessions Clock Company ("Sessions") was one of several notable American clock companies centered in Connecticut.Sessions and its predecessor (E.N. Welch Company), along with the E. Ingraham Company, the Ansonia Clock Company, the New Haven Clock Company, the Seth Thomas Clock Company, the William L. Gilbert Clock Company, and the Waterbury Clock Company collectively produced most of the ...
In 1940, Warren invented the "singing clock", which instead of a pendulum had a vibrating metal string. [2] General Electric acquired a half interest in Telechron in 1929, and full interest in 1943. [2] Telechron's clocks remained popular into the 1950s; the company eventually went out of business in 1992.