. Railway master mechanic [microform] . type of engine structurally, and, secondly, ♦From Indian Engineering. end of the engine; the second numerator gives the drivingwheels, while the third numerator includes any free wheelsplaced at the trailing end of the engine. When a tank en-gine is being described, a small T is placed after the thirdnumerator, the absence of this letter indicating that the en-gine is a tender engine. It is apparent that this formulagives a very sufficient description as to the structural typeof each engine, but to complete the classification more thana structural formul
. Railway master mechanic [microform] . type of engine structurally, and, secondly, ♦From Indian Engineering. end of the engine; the second numerator gives the drivingwheels, while the third numerator includes any free wheelsplaced at the trailing end of the engine. When a tank en-gine is being described, a small T is placed after the thirdnumerator, the absence of this letter indicating that the en-gine is a tender engine. It is apparent that this formulagives a very sufficient description as to the structural typeof each engine, but to complete the classification more thana structural formula is necessary, and this necessity has beenfully recognized and provided for by adding to it such di-mensions as enable any locomotive engineer to readily real-ize the power and calibre of the engine. This is done bythe addition of denominators, which, separated by the signof multiplication, are, in the order given, diameter of cylin-ders, diameter of the driving wheels (single or coupled) and 230 RAILWAY MASTER MECHANIC June, Showing Sheet Pressed with Offset. the working boiler pressure, the complete formula readinglike this: No. of freewheels at theleading end of theengine. No. of driving Nc of any free wheels and the wllPP, niPrpr| at . xt r l i wneei pjaceu atX No. ofwheelsv coupled to the the trailing end driving wheels. of the engine. Diameter of Diameter of Working boiler cylinders in X driving wheels in X pressure lbs. perinches. inches. square inch. Although there is no actual provision for compound en-gines this can easily be arranged by placing two dimensionsinstead of one in the space allotted to the diameters of thecylinders. The full formula gives, first of all, a code letter for thelocal use of each system for departmental reference, the keyto which is the formula giving a classification of type sup-plemented by the detailed description of dimensions, whichtaken in combination are capable of conveying an adequateidea of any class of locomotive which may
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
