Patent Model - Improvement in Indicators for Pressure-Gages

Maker and role
James Treat, Patentee
Production date
Mar 26 1878
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Object detail

Wood, brass, glass
8 3/4 x 6 x 6" (22.2 x 15.2 x 15.2cm)
Treat's patent "relates to improvements in indicators for steam, water, pressure, and vacuum gages, consisting in the combination, with any of the ordinary mechanism generally employed in such gages, of a stationary and a movable helix-shaped disk, of strongly-contrasting color, the latter disk being secured to the pinion-shaft, to which ordinarily the finger or pointer is attached." (Patent Number 201,637)
Object number
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