Patent Model - Variable Exhaust of Locomotive-Engines

Maker and role
Samuel Hay, Patentee
Production date
Oct 09 1855
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Object detail

Brass, wood
8 1/4 x 11 x 3 1/2" (21 x 27.9 x 8.9cm)
Hay's patent consists of making "a blast pipe self regulating, that is to open with every increase of volume and close with every decrease of volume, without the aid of the engineer, the pipe being acted upon in the same manner as the common safety valve will produce the desired effect." (Patent Number 13,648)
Object number
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