Aneroid Barometer, E. Bourdon, c. 1860 Canvas Print
Metal barometer consisting of a round dial mounted on a crane. The dial has a pointer and a scale running from zero to thirty-five. The mechanism inside consists of a flat tube, which is bent along the outside of the housing and curls or straightens at the pressure, and a small cog that transmits the movement of the tube to the pointer.
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