# Practical Physics

Longmans, Green, 1885 - Physics - 509 pages

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### Contents

 CHAPTER V 83 SKCTION PAGE 91 CHAPTER VI 128 SECTION PAGE 133 CHAPTER VII 152 CHAPTER VIII 164 Determination of the Velocity of Sound in Air by Measure 172 Determination of the WaveLength of a high Note in 180 CHAPTER X 211 The Method of Cooling 225 The Chemical Method of determining the Density 233 Kegnaults Hygrometer 241 Rumfords Photometer 248 SECTION PAGE 250
 The SpectroPhotometer 341 CHAPTER XVII 347 Magnetic Potential 353 Force due to a Solenoidal Magnet 359 SECTION PAGE 364 CHAPTER XVIII 381 G S Absolute Unit of Current 388 SECTION PAGE 401 CHAPTER XX 420 Standards of Resistance 426 Comparison of Electromotive Forces 435 The British Association Wire Bridge 451 PoggendorfTs Method for the Comparison of Electromotive 461 INDEX 483

### Popular passages

Page 14 - The rate of change of momentum is proportional to the impressed force, and takes place in the direction of the straight line in which the force acts.
Page 150 - Steiner. is true for bath a plane laminar body and a thin three-dimensional body, and states that the moment of inertia of a body about any axis is equal to its moment of inertia about a parallel axis through its...
Page 105 - The specific gravity of a solid or liquid is the ratio of the mass of the body to the mass of an equal volume of water at some standard temperature.
Page 212 - Specific Heat. The specific heat of any substance is the ratio of the quantity of heat required to raise a given weight of that substance one degree in temperature...
Page viii - Our general aim in the book has been to place before the reader a description of a course of experiments which shall not only enable him to obtain a practical acquaintance with the methods of measurements, but also as far as possible illustrate the more important principles of the various subjects.
Page 278 - The ratio of the angle subtended at the eye by the image...
Page 8 - ... parts of them have less analogy with the purely dynamical sciences. The most important functions belonging to instruments, or elements of instruments, are as follows : — 1. The Source of energy. The energy involved in the phenomenon we are studying is not, of course, produced from nothing, but it enters the apparatus at a particular place, which we may call the Source. 2. The channels or distributors of energy, which carry it to the places where it is required to do work. 3. The restraints,...
Page 212 - The specific heat of a substance is numerically equal to the number of calories required to raise the temperature of...
Page 442 - The rule therefore for obtaining the greatest galvanometer deflexion in a given system is as follows : Of the two resistances, that of the battery and that of the galvanometer, connect the greater resistance so as to join the two greatest to the two least of the four other resistances.
Page 250 - BR lie in the same plane. Reflection by a Plane Mirror.— The image is formed at a distance behind the mirror equal to the distance of the object in front of it; it is a virtual image, erect, and of the same size as the object. In Fig.