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Wearing away by rubbing or friction, or by poor or amatuer cleaning.
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A promoter instrumental in organizing the Elgin, Illinois, Cornell, and Peoria Watch Companies, and the Adams & Perry Manufacturing Company. He invented and patented the “Adams System” of time ...
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Tips of the teeth of a wheel beyond the pitch circle. Sometimes of circular outline; sometimes ogive—that is, of a shape patterned after the pointed arch. The addendum is also known as the “face” of ...
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The manipulation of the balance with its spring and staff to secure the most accurate time-keeping possible. Three adjustments are usually made, viz.: for isochronism, temperature and position. Much ...
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Strictly speaking this would cover all adjustment; but it is technically understood to mean an adjustment of the balance spring so that the time of vibration through the long and short arcs of the ...
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The manipulation of the balance and its spring so that a watch keeps time in different positions. Good watches are usually adjusted to five positions. They are pendant up; III up; IX up; dial up; ...
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The adjustment of the balance and spring so that the time-keeping qualities are affected as little as possible by changes in temperature. See Compensation.
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King of Judea, 742-727 B. C. See Dial of Ahaz.
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Sometimes spelled “alarum.” A mechanism attached to a clock whereby at any desired time a bell is struck rapidly by a hammer.
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An alloy of aluminum and pure copper, usually in the proportion of 10 parts of the former and 90 of the latter. It is considerably lighter than brass and highly resistant to wear.
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Greek astronomer to whom the Greeks ascribed the invention of the sun-dial in the sixth century B. C.
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The axle or axis on which a wheel of a watch or clock turns. Also applied to a spindle used by watchmakers. Or, the arbor which holds a pocket watch mainspring, e.g., mainspring arbor.
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Arc
Any section of the circumference of a circle.
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A famous Greek philosopher and scientist sometimes credited with the invention of the clock. About 200 B. C. he made a machine with wheel work and a maintaining power but having no regulator it ...
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Born 1736. An English watchmaker of note. He invented the helical form of the balance spring and a form of chronometer escapement much like Earnshaw’s. Died 1799. Arnold’s devices have been ...
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The putting together of the finished parts of a watch. In a three-quarter plate watch this is done on the lower plate. In a full plate movement it is easier and more satisfactory to assemble on the ...
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1. An instrument of various forms formerly used especially in navigation to measure the altitudes of planets and stars. 2. A projection of a sphere upon any of its great circles.
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Means solar time, as computed from observing the passage of the sun across the meridian from noon of one day to noon of the following day. It is counted continuously up to 24—not in two ...
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The science which treats of the motions, real and apparent, of the heavenly bodies. Upon this science, through its determination of the length of the year, is founded the science of ...
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Very common on old clocks and very complicated, such as: Indian King hunting with elephants, Adam and Eve, Christ’s flagellation, and many others. See Clocks, Interesting Old.
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