Martin, Louis Adolphe, 1880- · New York, J.Wiley & Sons, Inc.: [etc. etc.] · leaf 139
s individualparts. Exercise 173. From the result of Ex. 172 show that theefficiency of a machine must decrease with an increase in thenumber of its parts. 122 APPLIED STATICS Section XIX SCREWS The discussion of screws used for transmitting forceor energy involves sliding friction.Square-threaded… … Fig. 90 Then the only other forces acting upon the screw are thereactions of the nut upon it. These reactions will bedistributed over the left-hand hehcoidal surfaces of thethreads. The forces acting along any element of thesesurfaces (from a radius ri to a radius r^ may, withoutserious error, be…
Mechanics
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