Patent Model - Improvement in Power-Thermometers

Maker and role
William Grimshaw, Patentee
Production date
Dec 23 1879
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Object detail

Wood, iron, copper
7 x 10 x 6" (17.8 x 25.4 x 15.2cm)
Grimshaw's patent "relates to the construction of thermometers with the view of obtaining power; and it consists in the combination of a series of air-tight chambers having elastic heads and connected side by side at their centers, a rack-bar projecting from the outer head of one of said chambers, a shaft provided with means of transmitting motion and carrying a pinion meshing with said rack-bar, a pointer projecting radially from said shaft, and a graduated scale adjacent to said pointer." (Patent Number 222,897)
Object number
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