Image from page 321 of "Papers : literary, sicentific, &c." (1887)

Image from page 321 of "Papers : literary, sicentific, &c." (1887)


Identifier: papersliterarysi02jenk
Title: Papers : literary, sicentific, &c.
Year: 1887 (1880s)
Authors: Jenkin, Fleeming, 1833-1885 Colvin, Sidney, Sir, 1845-1927 Ewing, J. A. (James Alfred), Sir, 1855-1935
Subjects:
Publisher: London : Longmans, Green, and co.
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN


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Text Appearing Before Image:
ichis also part of /i, drives a belt ?, wdiich, in its turn, drives apulley m ; a second pulley, also part of m, drives a second beltand pulley n and 0. A piece of wood, forming part of 0, isbeing turned by a tool which forms part of d. We have herethree complete machines—1 st, the engine ; 2nd, the machineijhd^ driven by two transmitting joints and gdcg^ and driving atransmitting link /; 3rd, the machine mnod, driven by thetransmitting link I and the joint md^ and overcoming the usefulresistance at the joint od. All these machines have the elementd in common. The dynamic frame of the compound machine isshown in Fig. 29a, and the reciprocal figure for that frame in Fig.29/>. The driving element of the first machine is the steamwhich abuts against d^ the bed plate or support. The resisting 3IO APPLIED SCIENCE element is the whole series of driven machines in the last ofwhich a resistance is overcome between an element of themachine and the bed plate d. The resisting element is not

Text Appearing After Image:
complete unless we take into account the force it exerts at bothends; the one end of the resisting link of the first machinepushes up the periphery of the fly-wheel c, the other endpushes down the element rf; this is precisely the action we APPLICATION OF GRAPHIC METHODS 311 slioukl have, if the first machine had been completed by asingle resisting link; the circuit must in either case be com-pleted, so that the resisting link may abut against the commonelement c/, against which the first driving link also abuts. Thedriving link of the second machine ciJid is in the line of theresisting link of ahcde. The direction of this link is for bothmachines determined by the transmitting joint eg—i.e., by theform of the teeth of the wheels. The driving link of the machinemnod is in the line of the resultant tension duo to the band /,which is here a transmitting element. The driving or resistinglink of each successive machine, if taken by itself, would abutagainst the common element d. The fir


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Orignal From: Image from page 321 of "Papers : literary, sicentific, &c." (1887)