Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 530
sure, and the absolute ter-minal pressure, and they can both be obtained from thediagram by measuring with the scale adapted to the springused. Thus, in Fig. 204 the absolute initial pressuremeasured from the line of perfect vacuum V to line B is77 pounds, and the absolute terminal pressure… … Fig. 204 Second. Find mean forward pressure. Rule, Multiply absolute initial pressure by the hyper» bolic logarithm of number of expansions plus 1, and divide product by number of expansions. Thus, referring to Table 33, it will be s^en that the hyperbolic logarithm of 3.65 is 77X^.2947 1.2947, to…
