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 (1861)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 45
P =z the power, W= the weight, p z=the pitch, and I = length of the lever. Then since the lever forms the radius of the circle described by the power, and the circumference of a circle is 3-1416 times the diameter, and the diameter is twice the radius, P : W: :p:lx 2 X 3-1416. „ „ Wxp ^… … abt.128.] the screw. 43 Example 91.—What power will sustain a weight of 70000 lbs.by means of a screw having a pitch of -j^^th of an inch, and thelever to which the power is attached 8 ft. 4 in. in length ? SOLUTION. Here W = 70000 lbs., p = Jj in., and ? = 8 ft. 4 in. = 100 in. TTpr. P- ^Xp _…
Physics
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