. A text book of elementary mechanics, for the use of colleges and schools. = Fr. (1) ^-> Fig. 186. ports the total weight W, F = a. For P and F tend to turn thecylinder in opposite , on the principle of the in-clined plane, since the force Facting horizontally [229 (5)] sup- (2) 348 STATICS. [839. Im-oiu (1) and (2) P. It = tan «, P r tan a TT : 2T~ multiplying by 2t, P \.,t/- tan or If : ?,t// But %nr tan o- =z distance between the (breads, and2tt/2 is fcho circumference described by the power-arm; hence the relation already given is deduced, 239. Screw on t
. A text book of elementary mechanics, for the use of colleges and schools. = Fr. (1) ^-> Fig. 186. ports the total weight W, F = a. For P and F tend to turn thecylinder in opposite , on the principle of the in-clined plane, since the force Facting horizontally [229 (5)] sup- (2) 348 STATICS. [839. Im-oiu (1) and (2) P. It = tan «, P r tan a TT : 2T~ multiplying by 2t, P \.,t/- tan or If : ?,t// But %nr tan o- =z distance between the (breads, and2tt/2 is fcho circumference described by the power-arm; hence the relation already given is deduced, 239. Screw on the Principle of Work. Let the poweracting on its lever-arm cause it to describe a completecircumference Sri}; the work done by the power is then/\!tIi\ kt the same time the weight has been raised(or resistance overcome) through a distance equal tothat between two consecutive threads. Therefore II \ dist. between threads, / dist. between threadsII* ~2^R— ~ 240. Application of the Screw. The screw is practi-cally a most important mechanical instrument, beingused
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmechanics, bookyear18
