Hydrometer
National Museum of American History

Hydrometer

Unknown artist

overall: 2 1/2 in x 13 3/4 in x 4 1/2 in; 6.35 cm x 34.925 cm x 11.43 cm
National Museum of American History
CC0 — Public Domain
National Museum of American History

Brass hydrometer with square spindle marked “G. Atkins Fenchurch Street London.” There are three round brass weights, and a wooden sliding rule to correct the reading for changes in temperature. The signature is that of George Atkins, a mathematical instrument maker who had a shop on Fenchurch St. by 1804, and who later worked at other addresses.

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