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A manual of mechanical drawing (1907)
Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 31
Convex surface = J 1 (P + p). Entiresurface = convex surface + sum ofareas of upper and lower bases. Volume = - (A + a + -./ Aa) ; a = area3 ^ upper base or surface, A = area lower base or sur-face; p = perimeter upper base, P = perimeter oflower base. The Mechanical Powers. The Statistical Law for… … ^ ~ W + P -^ ~ W + P Bent levers are treat-ed the same as straightlevers, as in the figureP annexed. A MANUAL OF MECHANICAL DRAWING. 27 _J^ I X a © W 1 PI W a L 1 W — p 1 = Pa W \h 4. p = L w^¥=.-r^w L = W P-W Compound Levers.—When a compound lever is inequilibrium, the power multiplied by the…Mechanical drawing
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