## A Handbook of Physics Measurements, Volume 1John Wiley & sons, Incorporated, 1918 - Physical measurements |

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### Contents

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### Common terms and phrases

adjust angle angular axis of rotation balance beam body bright bubble candle power center of mass coincidence collimator compute concentration cross hairs curve cylinder denoted density determined diaphragm distance divided end knife edges equal equation error experiment eyepiece field of view glass grating horizontal hydrometer illumination incident inertia instrument kinetic friction lamp lens light liquid load luminous intensity Manipulation means measured meter method micrometer screw molar solution moved Nicol Nicol prism object obtained parallel photometer placed plane pointer polarization position principal focal length prism pulley pyknometer radius ratio Read Arts refractive index roller scale divisions scale reading sensitivity simple pendulum sinker slit solution specific gravity specimen spectrum speed spherometer spirit level standard masses substance sucrose sugar surface swings telescope temperature tion torque tracing point traversing tube vernier vertical vibration volume wave-lengths weight Whence wire Young's modulus

### Popular passages

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 104 - S mom = aJ, in which /is the moment of inertia of the body with respect to the axis of rotation.

Page 84 - Consider a rectangular rod of length L', breadth B, and depth D, fixed at one end and weighted at the other. The rod will become bent as in the figure. The upper portion of the rod is extended and the lower portion compressed. Since the rod is strained by a longitudinal stress, and since Young's modulus is defined as the ratio of the longitudinal stress to the longitudinal strain, Young's modulus may be determined from an observation of the amount of bending which a given force produces in the 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 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 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 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 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...

Page iii - 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 is given in detail and the required formula developed at length. The more important sources of error are pointed out, and means are indicated by which these errors may be minimized or accounted for.