Locomotive appliances . wn out, the longer can be the intervalbetween washings-out. To accomplish this, it isdesirable to have several cocks easy of manipulationin the lowest parts of the boiler for getting rid of theheavier impurities, anda surface cock for re-moving from the sur-face of the water anylight animal or vege-table matter that wouldtend to cause foaming orthe water raising in theboiler. To accomplishthis many styles of blow-off cocks have been device, quite gen-eral in its use, is theMcintosh pneumaticblow-off cock. Fig. 1 shows a sideand sectional view ofthis cock, which
Locomotive appliances . wn out, the longer can be the intervalbetween washings-out. To accomplish this, it isdesirable to have several cocks easy of manipulationin the lowest parts of the boiler for getting rid of theheavier impurities, anda surface cock for re-moving from the sur-face of the water anylight animal or vege-table matter that wouldtend to cause foaming orthe water raising in theboiler. To accomplishthis many styles of blow-off cocks have been device, quite gen-eral in its use, is theMcintosh pneumaticblow-off cock. Fig. 1 shows a sideand sectional view ofthis cock, which will be seen to consist of two checkvalves (A within the shell of the boiler and /> without),and a piston operated upon by air and released by aspring. Fig. 2 gives a view of the boiler head in thecab of a locomotive, indicating the air piping and operating valves, with iargedetail of the latter. When airor steam (preferably air) from a small valve in the cab(see Fig. 2) is admitted to the outward or top side of the. Fig. 1. Mcintosh Pneumatic Blow-Off Cock. (Sectional View.) 332 LOCOMOTIVE APPLIANCES. piston, as it appears in the engraving, Fig. 1, it actsagainst the piston, which shoves both check valvesopen and holds them open against the pressure in the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectlocomot, bookyear1901
