A Mechanical Text-book: Or, Introduction to the Study of Mechanics and EngineeringC. Griffin, 1873 - 312 σελίδες |
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Συχνά εμφανιζόμενοι όροι και φράσεις
acceleration acting actual energy angle of repose angular momentum angular velocity applied Article axes balance bars beam belt C₁ C₂ called centre of gravity coefficient comparative motion components cord counter-efficiency couple crank arm curve cylinder denote diameter direction of motion driving point epitrochoids equal and opposite equation expressed factor of safety figure fixed fluid frame friction inertia instantaneous axis intensity interval joint length line of action line of connection load machine magnitude mass mean mechanism moment of inertia moving pieces multiplied ordinates P₁ parallel forces parallel projection perpendicular distance piston pitch circle pitch surfaces plane polygon position pressure principles produced proportional pulley r₂ radius ratio rectangular relatively represent resistance respectively resultant rigid body rotating piece screw shearing shearing stress sliding straight line stress strut T₁ T₂ tion traversing velocity-ratio vertical weight wheel
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Σελίδα xii - 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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Σελίδα 227 - 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.
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Σελίδα 97 - 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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