divider: Quick Facts

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wing divider compass caliper length measurement tool mechanical drawing range finder odometer micrometer surveyor’s chain distance-measuring equipment hand tool radiation measurement machine tool psychological testing measurement system

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hand tool: Compass, divider, and caliper

Key People

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Georg von Reichenbach

German instrument maker

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Joseph Rogers Brown

American inventor

barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure

Fun Facts of Measurement & Math