# A Handbook of Physics Measurements, Volume 1

John Wiley & sons, Incorporated, 1918 - Physical measurements

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Page 104 - S mom = aJ, in which /is the moment of inertia of the body with respect to the axis of rotation.
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 - ... easy therefore to calculate the table of errors for the total weights by taking it for every 10000, 1000, 100, 10, and eventually for every milligramme. 13. — DENSITY OR SPECIFIC GRAVITY. By the density or specific gravity of a solid or liquid (we shall call this A ; see Tables 1 and 2) is meant the ratio of its mass to that of an equal volume of water at 4°. This latter has therefore the density 1. Instead of the ratio of the masses we may use that of the weights in vacua.
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 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 33 - The quantity s(p2I), which is called the moment of inertia of the body with respect to the axis...
Page iii - Although several pieces of apparatus, experimental methods, and derivations of formulae that possess some, novelty appear, our fixed purpose has been to use the standard forms except in cases where an extended trial in large classes has demonstrated the superiority of the proposed innovation. It has been assumed that the experiment is rare that should be performed before the student understands the theory involved and the derivation of the formula required. Consequently the theory of each experiment...
Page 183 - Then the angle between the axis of rotation and the line connecting the source and the mid-point of the first zone is 7° 30'.
Page 186 - ... zone, measured under a straight-edge resting on center and edge, should be located about three inches from the center, for an eight-inch lens. For an f/1, the depressed zone will have a depth of about eight thousandths of an inch. The exact depth will vary somewhat with the type of glass used, and the distance from the center of the lens to the center of the depressed zone. [212] Detail of film holder. The three small levers are loosely pivoted to the pressure plate. When swung out into the locking...