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Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency , so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks .
At Bell Labs in New York, Marrison was working on frequency standards using quartz as a reference. It was in 1927 that he developed the first quartz clock while working with J.W. Horton. The clock used a block of crystal, stimulated by electricity, to produce pulses at a frequency of 50,000 cycles per second. [5]
The application of these products depends on the original stone used. For engineered marbles the most common application is indoor flooring and walls, while the quartz based product is used primarily for kitchen countertops [2] as an alternative to laminate or granite. [3] Related materials include geopolymers and cast stone.
A crystal oscillator is an electronic oscillator circuit that uses a piezoelectric crystal as a frequency-selective element. [1] [2] [3] The oscillator frequency is often used to keep track of time, as in quartz wristwatches, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers.
Although less accurate than existing quartz clocks, it served to prove the concept of an atomic clock. [ 206 ] The first accurate atomic clock, a caesium standard based on a certain transition of the caesium-133 atom, was built by the English physicist Louis Essen in 1955 at the National Physical Laboratory in London. [ 207 ]
The Seth Thomas Clock Company was founded by Seth Thomas in Plymouth Hollow, Connecticut, and began producing clocks in 1813. [1] It was incorporated as the "Seth Thomas Clock Company" in 1853. [ citation needed ] Plymouth Hollow, a part of the town of Plymouth, was incorporated in 1875 as the town of Thomaston , named for Seth Thomas.
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