. Farm machinery and farm motors. 42. Internally fired boilers.—This class comprisesseveral types, the locomotive type (Fig. 216), the return-flue type (Fig. 217), and the Lancashire. The first twoof these types are the most used for traction or portablework, while the latter is adapted only to stationary use. 443. Locomotive type.—The locomotive fire-tube typewas probably the first of the modern boilers to come into 322 FARM MOTORS 1 STEAM BOILERS 323 general use. With only a few changes, it is the samenow. By referring to hig. 218, it will be noticed thatthe fire box is practically built int
. Farm machinery and farm motors. 42. Internally fired boilers.—This class comprisesseveral types, the locomotive type (Fig. 216), the return-flue type (Fig. 217), and the Lancashire. The first twoof these types are the most used for traction or portablework, while the latter is adapted only to stationary use. 443. Locomotive type.—The locomotive fire-tube typewas probably the first of the modern boilers to come into 322 FARM MOTORS 1 STEAM BOILERS 323 general use. With only a few changes, it is the samenow. By referring to hig. 218, it will be noticed thatthe fire box is practically built into the rear end of theboiler barrel. Extending from the rear tube sheet andthrough the entire length of boiler barrel arc the firetubes, which are generally about two inches in the lire box and fire tubes is the gives abundance of heating surface, also freedom ofcirculation. As the sides of the fire box are nearly flat,they will easily collapse under the pressure of the steam flt^aj- -^ aJTSiSa;. FIG. 217—RETURN-FLUE TYPE OF INTERNALLY FIRED BOILER unless supported by stay bolts at intervals of every fewinches. The steam dome can be located anywhere, but it isgenerally placed about midway between front and rearends. A pipe takes the steam from the top of the dome,carries it down through the steam space, where it is dried,then out wherever convenient. Generally the blow-off is at the bottom and in frontof the lire box. The water glass is placed about on a 324 FARM MOTORS level with the crown sheet, since this is the place wherethe water must not get low. 444. Round-bottom types.—The principal variationfrom the original type of this class of boilers is in the de-sign of the rear or furnace end. The common practice isto have the water pass completely around the fire box,including the under side. Such boilers are generallyknown as the round- or enclosed-bottom type (Fig. 218).As a rule, the draft can enter at front or rear of the firebox. This
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