the under side of the piston only; the air is ad- engraving of @ small non condensing beam pumping en- mitted from the heater by means of a puppet valve, E, moved great, and the engine will gain in power and speed. gine, constructed a few months ago by the Messrs. Gwynne, by acam, at G, on the main… … may be advantageously em- thereis no further escape for ployed in many situations. this, it acts upon the piston du- OO OO ring part of the down stroke, and equalizes the action of the WENHAM’S HEATED AIR ENGINE. will be a diminution in the power of the engine. This dif- engine;a small fly wheel…
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