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

الغلاف الأمامي
C. Griffin, 1873 - 312 من الصفحات
 

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الصفحة x - 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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الصفحة 231 - 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.
الصفحة 10 - 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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الصفحة 109 - 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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