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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.
The first clock powered by changes in atmospheric pressure and temperature was invented by Cornelis Drebbel in the early 17th century. Drebbel built as many as 18 of these, the two most notable being for King James VI & I of Britain, and Rudolf II of Bohemia. The King James clock was known as the Eltham Perpetuum, and was famous throughout Europe.
A caesium atomic clock from 1975 (upper unit) and battery backup (lower unit) [15] In 1949, Alfred Kastler and Jean Brossel [16] developed a technique called optical pumping for electron energy level transitions in atoms using light. This technique is useful for creating much stronger magnetic resonance and microwave absorption signals ...
In order to provide the shear magnetic lock with the appropriate holding force, then two pins lock the armature onto the magnet itself, and ensure that the magnet locks into place. An improved "shear" electromagnetic lock was patented on May 2, 1989, by Arthur, Richard and David Geringer of Security Door Controls, an access control hardware ...
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In 1941 a multi-layer printed circuit was used in German magnetic influence naval mines. Around 1943 the United States began to use the technology on a large scale to make proximity fuzes for use in World War II. [6] Such fuzes required an electronic circuit that could withstand being fired from a gun, and could be produced in quantity.
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