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Abrasion

Abrasion is the process of wearing down or rubbing away by means of friction.
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abrasion-watch case or mov't

Abrasion is caused by handling, slight wear, poor care or cleaning. 

Collectors need to become educated as to care of their properties by experts in the field.
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Adams, J. C.

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 records in use on most of the railroads in the West. He last appeared in prominent connection with the watch and clock business as the organizer of the Swiss horological exhibit at the World’s Columbian Exposition.

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Addenda

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 the
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Adjustment

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 of
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Adjustment To Isochronism

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 balance
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Adjustment To Positions

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Adjustment To Temperature Or ...

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Ahaz

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Alarm

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Aluminum-Bronze

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Anaximander

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Arbor

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

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Archimedes

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Arnold, John

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Assembling

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Astrolabe

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Astronomical Time

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Astronomy

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