## A Mechanical Text-book: Or, Introduction to the Study of Mechanics and Engineering |

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### Contents

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### Common terms and phrases

acceleration acting actual energy angle of repose angular momentum angular velocity applied Article axes balance bars beam called centre of gravity co-ordinates coefficient comparative motion components connected cord counter-efficiency couple cross-section curve cylinder denote diameter direction of motion driving point efficiency energy exerted epicycloids epitrochoids equal and opposite equation expressed factor of safety figure fixed fluid frame friction given axis inertia instantaneous axis intensity interval joint length line of action line of contact load machine magnitude mass mean mean effective pressure mechanism millimetres moving pieces multiplied oblique ordinates pair of points parallel forces perpendicular distance piston pitch surfaces plane polygon position pressure principles produced proportional pulley quantity radius ratio rectangular relatively represent resistance respectively resultant rigid body screw shearing shearing stress sliding square steam straight line stress tension tion traversing truss uniform unit velocity-ratio vertical weight wheel

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Page 4 - Suppose a* =n, then x is called the logarithm of n to the böge a ; thus the logarithm of a number to a given base is the index of the power to which the base must be raised to be equal to the number. The- logarithm of n to the base a is written Iog0 n ; thus log„ii = a; expresses the same relation, as a* = n.

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Page 239 - The Efficiency of a machine is a fraction expressing the ratio of the useful work to the whole work performed, which is equal to the energy expended. The limit to the efficiency of a machine is unity, denoting the efficiency of a perfect machine in which no work is lost. The object of improvements in machines is to bring their efficiency as near to unity as possible.

Page 16 - To find the area of a trapezoid. RULE. Multiply half the sum of the two parallel sides "by the perpendicular distance between them : the product will be the area.

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Page 117 - The tendency of a couple is to turn the body to which it is applied in the plane of the couple — that is, the plane which contains the lines of action of the two forces. (The...

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