Bond Box Chronometer

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This is a 56 hour chronometer with a later pattern Earnshaw spring detent escapement, and indications for hours, minutes, seconds, and up and down. It dates from around 1880. The chronometer bears the inscription "William Bond & Son, Boston" and "Bond's Break Circuit." The movement, like that of most Bond chronometers, was probably made in England, while the Bond break circuit mechanism was made in the U.S. The Department of Physics at Columbia University donated this instrument to the Smithsonian in 2001. The winding key is marked "512" and is thus from a different piece.
Currently not on view
overall: 11 5/16 in x 13 1/16 in x 11 3/16 in; 28.702 cm x 33.1978 cm x 28.448 cm
overall in case: 11 1/4 in x 10 15/16 in x 11 in; 28.575 cm x 27.78125 cm x 27.94 cm
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Medicine and Science: Physical Sciences
Measuring & Mapping
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National Museum of American History


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