# Elements of Physics

Longmans, Green, 1919 - Physics - 221 pages

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### Contents

 CHAPTER I 1 Magnetism Fundamental Facts 35 Terrestrial Magnetism 36 Electro 34 Current and Ohms Law 39 The Measurement of Current and Resistance 40 HYDROSTATICS 41 HEAT 71
 SOUND 106 LIGHT 128 Electricity 162209 162 APPENDIX 211 CONSTANTS 217

### Popular passages

Page 21 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
Page 159 - In myopia, or short sight, the focal length of the eye is too small and parallel rays are brought to a focus in front of the retina.
Page 21 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
Page 134 - The sine of the angle of incidence bears a constant ratio to the sine of the angle of refraction.
Page 1 - The straight line or distance be-tween the centres of the transverse lines in the two gold plugs in the bronze bar deposited in the office of the Exchequer...
Page 8 - If a number of forces acting at a point can be represented in magnitude and direction by the sides of a closed polygon taken...
Page 131 - All practical photometers are based upon the fundamental law that the intensity of illumination on a given surface varies inversely as the square of its distance from the source of light...
Page 137 - Let the mirror be rotated through an angle a about an axis through O perpendicular to the plane of the paper and let OR and OG be the positions of the reflected ray and normal after the rotation.
Page 159 - Usually, when the eye is at rest, it is adjusted so that the image of a distant object is in focus on the retina.
Page 1 - ... one ten-millionth part of the distance from the North Pole to the Equator, measured on the meridian of Paris. This is called the 'metre