# A Handbook of Physics Measurements, Volume 1

John Wiley & sons, Incorporated, 1918 - Physical measurements

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Page 174 - The candlepower of ordinary illuminating gas is measured while burning at the rate of 5 cubic feet per hour, under a pressure of .5 inch of water. To secure very exact measurements, small corrections must be made for the temperature of the gas and for the moisture contained in it. The candle should always be weighed before and after each test, and allowances must be made in computing the candlepower of the light under examination...
Page 84 - Young's modulus may be determined from an observation of the amount of bending which a given force produces in the rod. The object of this experiment is, by the method of bending, to determine the Young's modulus of the material composing a rectangular rod.
Page 32 - The Specific Gravity or relative density of a substance is the ratio of its density to the density of some standard substance.
Page 104 - S mom = aJ, in which /is the moment of inertia of the body with respect to the axis of rotation.
Page 31 - Errors due to difference in the lengths of the balance arms and to difference in the masses of the scale pans can be nearly eliminated by weighing the body first in one pan and then in the other.
Page 33 - The quantity s(p2I), which is called the moment of inertia of the body with respect to the axis...
Page 222 - In a right triangle the square of the hypotenuse equals the sum of the squares of the other two sides or legs.
Page 14 - ... with notched wheels D which permit lines to be drawn of unequal length, so that in ruling a scale every fifth and tenth line may be drawn longer than the others. The Filar Micrometer Microscope is a microscope that has in the focal plane of the eyepiece two parallel cross hairs, a and b (Fig. 6), which can be moved across the field of the microscope by means of a micrometer screw. In the focal plane there is also a fixed serrated edge, cd, the teeth of which serve as a scale to indicate the whole...
Page 120 - The ratio of the speeds of light in any two media is called the index of refraction of the second medium relative to the first.
Page 47 - When the body is lighter than the liquid in which it is to be immersed, a sinker is attached. Weighings are made to determine : first, the weight of the body in air...