London
George Adams, Sr. Wood, glass, and brass; H. 30 in. (76.2 cm), W. 12 7/8 (32.7 cm), D. 26 in. (66.0 cm); base: H. 20 1/8 (51.2 cm), 18 3/4 in. (47.6 cm), 18 7/8 in. (47.9 cm); without glass bell jars: H. 22 1/4 in. (56.5 cm), 12 7/8 (32.7 cm), 25 1/2 in. (64.8 cm) Independence National Historical Park (Philadelphia, Pa.) The air pump was commonly used in scientific experiments to demonstrate the effects of raising or lowering air pressure in a closed container. George Adams, the maker of this pump, was Mathematical Instrument Maker to His Royal Highness the Prince of Wales (later George III).
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