Elementary Text-Book of Theoretical Mechanics

Elementary Text-Book of Theoretical Mechanics

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...levers of the first order the applied force may be greater The employment of the letters P and W, to represent respectively the applied force and the weight, has become a matter of conventional usage. It is assumed, of course, that W does not always stand for a weight or gravitational action, but may be a load, or a tension, or resistance of any kind whatsoever. The applied force P is frequently called the "power"; whence the symbol P. This use of the word "power," referring to a force merely, is not consistent with our previous acceptance of its meaning in the sense of "rate at which a machine can do work." For the sake of accuracy we shall adhere to the expression "applied force," symbolized by the capital P. or less than the load. In levers of the second order the applied force is always less than the load, while in levers of the third order the load is less. Compound Levers.--In some devices--certain gate latches and wagon brakes, for examples--a train of levers is used to multiply the force or motion, as the case: may be. As shown in _T A B Fig. 67, the weight, or resistance, of one is Fig. 67' propagated to the next as an applied force. It is not necessary that all in the series be levers of the same order. Other examples of compound levers are found in platform scales, typewriting machines, piano keys, the trigger of a gun, and in railroad switches. EXAMPLES 1. To which class of levers would you assign each of the following devices: Pair of pliers, sugar tongs, scissors, nut cracker, blacksmith's vise, blacksmith's tongs. 2. Name five devices in which the lever is used. At least one of the five must refer to the lever of the third order. 3. How many of the three kinds of levers are illustrated in the...show more

Product details

  • Paperback | 66 pages
  • 189 x 246 x 4mm | 136g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236635760
  • 9781236635761