Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . 60 97 • 76 97-5 98 61 3P9-44 77 99 *1 77 25 ^ 99-5 62 4717.
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . 60 97 • 76 97-5 98 61 3P9-44 77 99 *1 77 25 ^ 99-5 62 100 THE INDICATOR 229 terminal pressure, and they can both be obtained fromthe diagram by measuring with the scale adapted tothe spring used. Thus, in Fig. 105 the absolute initialpressure measured from the line of perfect vacuum Vto line B is 77 lbs., and the absolute terminal pressureMeasured from V to line B is 21 lbs. The ratio, ornumber of expansions, is found thus: Rule. Divide the absolute initial pressure by theabsolute terminal pressure; thus, 77 + 21 = = num-ber of expansions. Second. Find mean forward Figure 105 Rule. Multiply absolute initial pressure by thehyperbolic logarithm of number of expansions plus itnd divide product by number of expansions. Thus]eferring to Table 14, it will be seen that the hyper-•olic logarithm of is , to which 1 must bedded. Then ^^47 = ^ ^ which .g ^ ^ Jte mean forward pressure. From this deduct thejbsolute back pressure, which is 16 lbs. or 1 lb. abovetmosphere; thus, = lbs. M. E. P. Third. Find I. H. P. Area of piston minus one-half area of rod x 230 LOCOMOTIVE ENGINEERING M. E. P. x piston speed in feet per minute, divided by33,000. Thus (the diameter of rod being 3 in.), = g L H> p -33,000The steam consumption per I. H. P. per hour mayalso be computed by means of Table 16, which wasoriginally calculated by Mr. Thomson, and is basedupon the follow
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
