Browse Items (60 total)

Received October 26, 1866; item 52

A patented axle and wheels which are adjustable to different track gauges. This idea was never used. At the time of design, there were many track gauges in use.

The indicator is an instrument for drawing a diagram on paper which shall accurately represent the various changes of pressure on one side of the piston of an engine during both the forward and the return stroke.

One set of 14 pieces of apparatus to make up the Pollack-Virag system of rapid telegraph