International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 453
ed, except during the down stroke ofthe plunger; for, if it were open during the up stroke, thepressure below the plunger being less than the pressure ofthe atmosphere above, the air would rush in instead of beingexpelled. 1083. Double-Acting Pumps.—In the pumps pre-viously described, the discharge… … Fig. 210.power to run the pump with an intermittent discharge, as alittle consideration will show. If the height that the wateris to be raised is considerable, its weight will be very great,and the entire mass must be put in motion during one strokeof the piston. In order to obtain the advantage of…
Railroad engineering
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