. Farm machinery and farm motors. ^ economical. They require little floor spaceand are easily installed. In construction they consist ofa vertical shell, in the lower end of which are the fire boxand ash pit; extending up from the furnace and reachingthe top are the fire flues. 320 FARM MOTORS Since the shell of the fire box is under external pres-sure, it must be stayed to avoid collapsing. The blow-off cock and frequent hand holes are near the base for. EXTERNALLY FIRED BOILER AA, boiler setting; BB, boiler front; CC, boiler shell; Z?A flues; E, flue door; F,handhole; G, flue sheet; //, brac
. Farm machinery and farm motors. ^ economical. They require little floor spaceand are easily installed. In construction they consist ofa vertical shell, in the lower end of which are the fire boxand ash pit; extending up from the furnace and reachingthe top are the fire flues. 320 FARM MOTORS Since the shell of the fire box is under external pres-sure, it must be stayed to avoid collapsing. The blow-off cock and frequent hand holes are near the base for. EXTERNALLY FIRED BOILER AA, boiler setting; BB, boiler front; CC, boiler shell; Z?A flues; E, flue door; F,handhole; G, flue sheet; //, bracket; /, steam dome; /, safety valve; A, steampipe; L, steam gauge; M, steam gauge syphon; NN, try cocks; O, waterglass: PS, blow-off pipes; Q, blow-off valve; TT, fire door; [/, fire door lining;V, ash door; IV, grates- X, bridge wall; V, ash pit; Z, britchen; A, damper. convenient cleaning. A water glass and try cocks arenear the top. Heating surface in this type of boiler con-sists of the fire box and the fire tubes up to the water STEAM nOlLERS 321 line; as the water does not completely cover the tubes,the upper part forms a superheater. When the exhaust steam is released into the stack, thetubes have a tendency to leak. To avoid this, somemanufacturers sink the tube sheet below the water level(Fig. 213). This form reduces the superheating surface,and moreover, since the conical smoke chamber is sub-jected to internal pressure, it is likely to
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