. Farm machinery and farm motors. ank.—Boilers used fortraction purposes require a small supply ttank to which the boiler pump or the in-_. A. jector is connected. This tank is gener- ally placed in some position where it isconvenient, yet out of the way. 451, Siphon or ejector—When thesupply tank is placed so high that it can-not be filled from a stock tank or othersimilar source, a siphon (Fig. 225) isgenerally used. The construction ofthis is such that a jet of steam is passedinto a water pipe leading from the tankor cistern to the supply tank. As thesteam comes in contact with the waterit
. Farm machinery and farm motors. ank.—Boilers used fortraction purposes require a small supply ttank to which the boiler pump or the in-_. A. jector is connected. This tank is gener- ally placed in some position where it isconvenient, yet out of the way. 451, Siphon or ejector—When thesupply tank is placed so high that it can-not be filled from a stock tank or othersimilar source, a siphon (Fig. 225) isgenerally used. The construction ofthis is such that a jet of steam is passedinto a water pipe leading from the tankor cistern to the supply tank. As thesteam comes in contact with the waterit is condensed; this produces a vacuumsuch that the water rushes in to fill, and the inertia due to the velocity of the steam sends it alonginto the supply tank. Care must be taken in regard to the amount of steamused, since if too much steam be used the water will be-come so warm that the feed pump or injector will notwork. 452. Feed pumps.—There are three types of pumpsnow in use: the crosshead pump, the independent direct-. FIG. 225—SYPHONFOR FILLING SUP-PLY TANK STEAM BOILERS 331
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