. Farm machinery and farm motors. FIG. 22]—INDEPENDENT DIRECT-ACTING PUMP 332 FARM MOTORS. FIG. 228- -INDEPENDENT PLUNGERPUMP acting (Marsh) pump, andthe independent phingerpump (Figs. 226, 22^, and228). The crosshead typeis the simplest and mosteconomical, but can be run C-^*^)f^\ //W4l\w\^ °^^ when the engine isK/^JmAl/nX^vX running. The Marsh inde-pendent pump is simple andeconomical, but the actionof its steam valve is deli-cate andshould be molestedonly by an expert. The in-dependent plunger pump isvery satisfactory in that itcan be run at any time and by any one. The initial costof this
. Farm machinery and farm motors. FIG. 22]—INDEPENDENT DIRECT-ACTING PUMP 332 FARM MOTORS. FIG. 228- -INDEPENDENT PLUNGERPUMP acting (Marsh) pump, andthe independent phingerpump (Figs. 226, 22^, and228). The crosshead typeis the simplest and mosteconomical, but can be run C-^*^)f^\ //W4l\w\^ °^^ when the engine isK/^JmAl/nX^vX running. The Marsh inde-pendent pump is simple andeconomical, but the actionof its steam valve is deli-cate andshould be molestedonly by an expert. The in-dependent plunger pump isvery satisfactory in that itcan be run at any time and by any one. The initial costof this is more than thatof other types. 453. The injector i sprobably the most gen-erally used means o ffeeding boilers. It wasinvented in 1858 by , and large num-bers of the same typesare still made. The ac-tion of the injector willbe understood by refer- (J^^ering to the sketch(Fig. 229). Steam istaken from the boilerand passes through thenozzle A to the injector; ,, 1. r i. • FIG. 229—PRINCIPLE OF THE the amount 01 steam is injector
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