to pass downward and becomethoroughly cooled on its way to the bottom, and throughwhich space it flows on its way back to the heater. Thepower piston, B, likewise extends downward into the heater,F, which presents to the action of the fire a narrow annnlusall round the bottom. Within this heater is… … EAPPS FIRE PLUG. bottom of the heater. Its office is to cause the air whichflows from the compression cylinder to be presented in a thinsheet all round the interior surface of the heater, and par-ticularly at the lower and hotter portion. By this means theair is thoroughly and rapidly heated. The…
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