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Engineer's Graduating-Valve.

Description: Patent for an graduating valve that is used with air brake systems in railroad trains. The invention is meant to "produce a comparatively simple valve which is constructed in such a way that it is not likely to clog or get out of order, which is arranged so that successive regular reductions may be easily made in the pressure of air in the train service pipe, which is adapted to automatically act on the governor of the air pipe from pressure either above or below the main valve, which is constr… more
Date: August 15, 1893
Creator: Pelham, Walter O.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Releasing Device for Brakes of Locomotive Drive-Wheels.

Description: Patent for a simple and durable improved releasing device for brakes of locomotive drive-wheels that prevents "the drive wheels from being locked and sliding on the track rails, to obviate the uneven wear on the wheel tire" (lines 15-18). The invention has an auxiliary piston connected to the triple valve piston and is controlled by back pressure in the steam chest.
Date: November 27, 1894
Creator: Pelham, Walter O.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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