. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. have 20 X 3-1416 X 2= 125-664, the tircuinfereiice ofthe power; and 125-664 to {, or 251-;i28 to 1, isthe toice of the screw alone. Again, 18 : 2 or 9:1,being the proportion of the wheels to the pinions, andthere being three of them, 93 : 1 or 729 : 1 is thepower gained by the wheels. 1329. Conse(jiiently 251 -328 x 729 to 1, or 18321 8^to 1 nearly, is the ratio of the power to the weightarising from the joint advantage of the screw and thewheels. T
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. have 20 X 3-1416 X 2= 125-664, the tircuinfereiice ofthe power; and 125-664 to {, or 251-;i28 to 1, isthe toice of the screw alone. Again, 18 : 2 or 9:1,being the proportion of the wheels to the pinions, andthere being three of them, 93 : 1 or 729 : 1 is thepower gained by the wheels. 1329. Conse(jiiently 251 -328 x 729 to 1, or 18321 8^to 1 nearly, is the ratio of the power to the weightarising from the joint advantage of the screw and thewheels. The power, however, is 150 pounds ; there-fore 150 y 183218^ or 27482716 pounds is the weightthe man can sustain, e(]ual to 12269 tons. 1330. It must he observed, that the power has toovercome not only the weight, but at the same timethe friction undergone by the screw, which in somecases is so great as to be equal to the weight itself;for it is sometimes sufficient to sustain the weightwhen the power is taken off. OI lUlCTlON. 1331. niough in a preceding page we have slightlytouched on the effect of friction, it is to lie keptin mind that t
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