. The steam-engine and other heat-motors. c pressure. 3. That there is no apparent advantage in working pumpson the compound principle. Dimensions.—When air-pumps are directly connected to theengine so that they make the same number of strokes, the follow-ing dimensions have been used: For jet-condensing engines having vertical, single-acting air-pumps the area of the air-pump piston or bucket multiplied byits stroke may be from 1/5 to 1/10 the capacity of the cylinder;if the pump were horizontal and double-acting its capacity maybe from 1/8 to 1/16 of the cylinder. For surface conde
. The steam-engine and other heat-motors. c pressure. 3. That there is no apparent advantage in working pumpson the compound principle. Dimensions.—When air-pumps are directly connected to theengine so that they make the same number of strokes, the follow-ing dimensions have been used: For jet-condensing engines having vertical, single-acting air-pumps the area of the air-pump piston or bucket multiplied byits stroke may be from 1/5 to 1/10 the capacity of the cylinder;if the pump were horizontal and double-acting its capacity maybe from 1/8 to 1/16 of the cylinder. For surface condensing engines the single-acting air-pumpcapacity may be 1/10 to 1/18 of that of the cylinder, andthe capacity of the double-acting pump would be 1/15 to 1/25 ofthe volume of that cylinder. On torpedo-boats with main engines making 330 revolutionsper minute the ratio of directly connected air-pump volume sweptthrough per revolution is from 1/36 to 1/30 of that swept through CONDENSERS AND AIR-PUMPS. z& AIR PUMP ORDINARY
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