. Farm machinery and farm motors. irir 1 kV/T. -^^4^. FIG. 212—VERTICAL BOILER FIG. 213 VERTICAL BOILER WITH SUBMERGED FLUES efficient. The next was merely a shell with one tube orflue, as it is often called. Multitubular, return tubular,internally fired, water-tube, sectional boilers, etc., havecome in in succession until we have the present-daytypes. 439. Classification,—Steam boilers may be classified ac-cording to their form and use. Thus we have locomotive, STEAM BOILERS 319 marine, portable, semi-portable, and stationary boilers,according to use; and according to form we have hori-zontal
. Farm machinery and farm motors. irir 1 kV/T. -^^4^. FIG. 212—VERTICAL BOILER FIG. 213 VERTICAL BOILER WITH SUBMERGED FLUES efficient. The next was merely a shell with one tube orflue, as it is often called. Multitubular, return tubular,internally fired, water-tube, sectional boilers, etc., havecome in in succession until we have the present-daytypes. 439. Classification,—Steam boilers may be classified ac-cording to their form and use. Thus we have locomotive, STEAM BOILERS 319 marine, portable, semi-portable, and stationary boilers,according to use; and according to form we have hori-zontal and vertical boilers. Further, the horizontal classmay be subdivided into internally and externally fired,shell, return-flue, fire-tube and water-tube boilers. For
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