The Theory of Machines: Part I. The Principles of Mechanism. Part II. Elementary Mechanics of Machines, Part 1

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McGraw-Hill book Company, Incorporated, 1917 - Machine theory - 340 pages
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Page 104 - PITCH AND LEAD OF SCREW THREAD. The terms " pitch " and " lead " of screw threads are often confused. The pitch of a screw thread is the distance from the center of one thread to the center of the next thread, whether the screw has a single, double, triple, or quadruple thread.
Page 177 - ... operating lever as shown. In this case the pull in one side of the band assists the operating force. The force of friction necessary to balance a given torque is found for this kind of brake as it was for the block brake, and is equal to TI — T2, the difference between the tensions on the tight and slack sides of the band.
Page 331 - If the frequency of oscillation is found to be 42 cycles/mm., what is the moment of inertia of the rod about its center of gravity?
Page 123 - ... illustrate this, suppose a pair of gears had 80 teeth each, the velocity ratio between them thus being unity; then a given tooth of one gear would come into contact with a given tooth of the other gear at each revolution of each gear, but if the number of teeth in one gear were increased to 81 then the velocity ratio is nearly the same as before and yet a given pair of teeth would come into contact only after 80 revolutions of one of the gears and 81 revolutions of the other. The odd tooth is...
Page 184 - Rz act at angle <t> to the normal to their surfaces and, from what has already been said, it will be understood that when...
Page 79 - In the first place, when the wheels drive the pinions, the number of teeth in any one pinion should not be less than 8 ; but rather let there be 11 or 12 if it can be done conveniently. And in the particular form of teeth described in Art.
Page ii - American Engjneer Electric Railway Journal Coal Age Metallurgical and Chemical Engineering Power THE REGULATION OE RIVERS BY /AN ORNUM, CE, M.
Page 331 - FIG. 193. — Inertia of rod. Next secure a knife edge in a wall or other support so that its edge is exactly horizontal and hang the rod on it with the knife edge through one of the pin holes and let it swing freely like a pendulum. By means of a stop watch find exactly the time required to swing from one extreme position to the other; this can be most accurately found by taking the time required to do this say, 100 times. Let t sec. be the time for the complete swing. Next measure the distance...
Page 314 - Masses. — possible to balance any number of rotating masses by means of two properly placed weights in any two desired planes of revolution, and the method of determining these weights has been fully explained. The present and following sections deal with a much more difficult problem, that of balancing masses which do not revolve in a circle, but have either a motion of translation at variable speed, such as the piston of an engine or else a swinging motion such as that of a connecting rod or...
Page 180 - ... resistance to the sliding of one body upon another depended upon the normal pressure between the surfaces and not upon the areas in contact nor upon the velocity of slipping, and further that if F is the frictional resistance to slipping and N the pressure between the surfaces, then F = nN where n is the coefficient of friction and depends upon the nature of the surfaces in contact as well as the materials composing these surfaces. A discussion of this subject would be too lengthy to place here...

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