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A balance wheel, or balance, is the timekeeping device used in mechanical watches and small clocks, analogous to the pendulum in a pendulum clock.It is a weighted wheel that rotates back and forth, being returned toward its center position by a spiral torsion spring, known as the balance spring or hairspring.
In watch movements the wheels and other moving parts are mounted between two plates, which are held a small distance apart with pillars to make a rigid framework for the movement. One of these plates, the front plate just behind the face, is always circular, or the same shape and dimensions as the movement.
Center or second wheel which turns once per hour. Its pinion is turned by the teeth on the mainspring barrel in watches and spring driven clocks, and by the weight pulley in weight driven clocks. Its arbor projects through a hole in the face and drives, via a friction coupling, the cannon pinion , which carries the minute hand .
Rotary Watches: 1895 La Chaux-de-Fonds: Moise Dreyfuss Elm Yard, 13-16 Elm Street, United Kingdom Privately held company: Dreyfuss Group Ltd. Sandoz (watch company) Tavannes: Henri Sandoz Schwarz Etienne: 1902 Paul Arthur Schwarz and Olga Etienne La Chaux-de-Fonds: Privately held company: Solvil et Titus: 1892 Paul Ditisheim: Hong Kong, Hong Kong
Rotary Watches Ltd was established at La Chaux-de-Fonds, Switzerland by Moise Dreyfuss in 1895. By the 1920s family members Georges and Sylvain Dreyfuss began exporting Rotary watches to Britain, which was to become the company's most successful market. Rotary later became the official watch supplier for the British Army.
Verge timepieces tend to accelerate as the crown wheel and the pallets wear down. This is particularly evident in verge watches from the mid-18th century onward. It is not in the least unusual for these watches, when run today, to gain many hours per day, or to simply spin as if there were no balance present.
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The California Mart was built for Harvey and Barney Morse, two brothers from New York City who started a clothing factory in Downtown Los Angeles in the early 1960s. [2] [3] [4] The three 13-story buildings were designed in the modernist architectural style. [5] [6] [7]
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