ws could not work together; and further, if the thicknessof the threads be unduly diminished, they will not be able tobear the strain upon them. Thisdifficulty is obviated in HuntersScrew, in which a screw A workswithin another screwP; thus if c bethe radius of the circle describedby P,—b, a the… … hunters screw. 151 a in consequence of the screw A making one turn withinB\ i.e. TF will descend through i — a. Whence P. P^sdisplacement = W. Wa displacement gives P.2irc=W.{h-a), , W 2irc^^-Pb^a and by making b as nearly equal to a as we please, the me-chanical advantage may be increased to any…
Mechanics
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