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Knight's Mechanical Encyclopedia (ed. Knight) 1 1 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
r by stationary engines at the depots and way-stations. The air operation was substantially similar to that of a steamengine, the air being admitted from alternate reservoirs to the sides of the pistons with which the said reservoirs respectively communicate. The pistonrod is connected in the usual manner with the crank and driving-shaft. An engine, similar in most material respects to the above, was made by Baron von Rathlen, in 1848, and was driven by its air motor from Putney to Wandsworth (England), at the rate of ten or twelve miles per hour. Parsey, in 1847, invented an engine of this character in which a large reservoir A was secured to a frame mounted on wheels. In this reservoir the air was compressed to as great an extent as was compatible with safety, and was emitted gradually into the chamber B, where it expanded to its working pressure. This emission is regulated automatically by a plunger in a tube passing through the roof of the chamber B. Above the plunger is a