. Electric railway review . -face condensers, but unlike the elevated jet condenser someprovision mast be made for removing the air with a pump,either of the wet or dry vacuum type. Air that accumulatesin a surface condenser is in the compartment together withthe condensation and in no way comes in contact with the cir-culating water. The movements of the condensations are com-paratively slow and not sufficient to remove the air. The airmay be taken together with the water, or separately, as shownin Figures 2S and 29, Chapter 4. The wet vacuum pump is thatmost generally used and is so termed b
. Electric railway review . -face condensers, but unlike the elevated jet condenser someprovision mast be made for removing the air with a pump,either of the wet or dry vacuum type. Air that accumulatesin a surface condenser is in the compartment together withthe condensation and in no way comes in contact with the cir-culating water. The movements of the condensations are com-paratively slow and not sufficient to remove the air. The airmay be taken together with the water, or separately, as shownin Figures 2S and 29, Chapter 4. The wet vacuum pump is thatmost generally used and is so termed because it handles theair together with the condensation. This class of pump isalso used for the suction type jet condensers to remove theair and condensation, and when so used is generally styledan air pump. The class of service is practically the samefor both condensers, the jet condenser having approximatelythirty times as much water to handle and a correspondinglygreater amount of air. The action of this combined air and. Figure 270—(J1-2). water vacuum pump is somewhat peculiar, its jerky motionnot being generally understood. Figure 270 (J 1-2) shows;lie wet vacuum pump attached to a condenser. When thepump is in regular operation, but little condensation is beinghandled, and that is well down in the suction pipe. When thepump is discharging the contents of the water end. one side isunder pressure marked -f- and the other side is at the samepressure as the condenser and is marked —. The pressurebehind the steam cylinder is also under pressure marked +,this pressure being maintained sufficiently high to overcome 468 ELECTRIC RAILWAY REVIEW Vol. XVI1. No. 14. the pressure on the water end marked -f. The work per-formed in compressing the contents in the water cylindermarked -f is similar to compressing a spring. The air con-tained in the water cylinder being the elastic body, as soonas the steam valve has crossed over the port and allowed theexhaust port to communicate wi
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