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Natural philosophy. including statics, hydrostatics, pneumatics, dynamics, hydrodynamics, the general theory of undulations, the science of sound, the mechanical theory of music, etc. : designed for the use of normal and grammar schools, and the higher classes in common schools (1867)

Sangster, John Herbert, 1831-1904 · Montreal : Printed and published by John Lovell · leaf 45

An illustration from Natural philosophy. including statics, hydrostatics, pneumatics, dynamics, hydrodynamics, the general theory of undulations, the science of sound, the mechanical theory of music, etc. : designed for the use of normal and grammar schools, and the higher classes in common schools, 1867, leaf 45
crew, let P = the power, W = the weight, p3= the pitch, and 1 = length of the lever. Then since the lever forms the radius of the circle described bythe power, and the circumference of a circle is 3-1416 times thediameter, and the diameter is twice the radius, P : W :: p : 1 X 2 X3-1416. TT.„. D… … I Art. 128.] THE SCREW. 43 Example 91.—What power will sustain a weight cf 70000 lbs.by means of a screw having a pitch of t^^- of an inch, and thelever to which the power is attached 8 ft. 4 in. in length? SOLtTTION. Here IF — 70000 lbs., p = -J^- in., and ^ = 8 ft. 4 in = 100 in.XT r> ^^P…

Physics

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