Patent Model - Improvement in Pressure-Gages
Maker and role
William Snyder, Patentee
May 15 1877
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6 x 6 x 2" (15.2 x 15.2 x 5.1cm)
Snyder's patent "relates to gages for indicating pressure in hydraulic cylinders; and it consists of a solid piston of small area, whose outward motion is opposed by a strong adjustable spiral spring, and whose outer extremity is connected with an index that moves in front of a graduated arc." (Patent Number 190,790)
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