. Graphical and mechanical computation . cales. Reaction TurbineModulus Equation nti = x = Ns m<i = y = N_ m3 = z = w2w3 Scale Limits Ns 10 to IOO N up to 2000 1000 H 200 Length 910 9 W4 = Wl / = W 10 Scale H Limits2 to 6up to 2000 1000 Tangential Water Wheel Modulusmi = = = $ <o « « ftji1. IHEAD (H) IN,/,,,,,,,,, ,111.) ...,,, ,????,., SPEED IN) IN REV. PER MIN. () SPECIFIC SPEED OF TURBINE AND WATER WHEEL. n VTTTp. Fig. 386. versal on which the index lines intersect, one index line joining Nt and Na
. Graphical and mechanical computation . cales. Reaction TurbineModulus Equation nti = x = Ns m<i = y = N_ m3 = z = w2w3 Scale Limits Ns 10 to IOO N up to 2000 1000 H 200 Length 910 9 W4 = Wl / = W 10 Scale H Limits2 to 6up to 2000 1000 Tangential Water Wheel Modulusmi = = = $ <o « « ftji1. IHEAD (H) IN,/,,,,,,,,, ,111.) ...,,, ,????,., SPEED IN) IN REV. PER MIN. () SPECIFIC SPEED OF TURBINE AND WATER WHEEL. n VTTTp. Fig. 386. versal on which the index lines intersect, one index line joining Nt and Nand the other joining and H. Fig. 38ft gives the completed chart; for the reaction turbine, the indexlines show that when N = 1000 , H = 70 ft., and = 201,then N, = 70; for the tangential water wheel, the index lines show thatwhen N = 1000 , H = 700, and = 275, then N% = 7& NOMOGRAPHIC OR ALIGNMENT CHARTS Chap. IV (V). EQUATION OF FORM Mu) -/,(«) -ft{w) • /4(t) ....TWO OR MORE INTERSECTING INDEX LINES. 39. Charts for equation (V). — A large number of equations involv-ing three or more variables can be written in the form (V), which issimilar to the second form of equation (II), but in Art. 28 we used log-arithmic scales, whereas here we shall use natural scales. Equation (TV)is a special case of equation (V) when there are
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