Page:Eddington A. Space Time and Gravitation. 1920.djvu/232

216 * Eclipse, observations during, 113
 * Ehrenfest's paradox, 75
 * Electrical theory of inertia, 61
 * Electricity and gravitation, 167
 * Electromagnetic potentials and forces, 172
 * Electron, dimensions of, 177; geometry inside, 91; gravitational mass of, 178; inertia of, 61; Kaufmann's experiment on, 62, 146; singularity in field, 167
 * "Elsewhere," 50
 * Emptiness, perception of, 190
 * Energy, conservation of, 139; identified with mass, 146; inertia of, 61, 146; weight of radio-active, 112
 * Entropy, 149
 * Eötvös torsion-balance, 112
 * Equivalence, Principle of, 76, 131, 212
 * Euclidean geometry, 1, 47, 73
 * Euclidean space of five dimensions, 84
 * Event, definition of, 45, 186
 * Evershed, 130
 * Extension in four dimensions, 37, 46


 * Feeling, elements of, 192
 * Fields of force, artificial, 64; due to disturbance of observer, 69; electromagnetic, 171; relativity of, 67
 * Field of velocity, 195
 * FitzGerald contraction, 19; consequences of, 22; modified by acceleration, 75; relativity explanation of, 54
 * Flat space in two dimensions, 80
 * Flat space-time, 83; at infinity, 84; conditions for, 89
 * Flatfish, analogy of, 95
 * Flatland, 57
 * Force, compared with inertia, 137; electromagnetic, 172; elementary conception of, 63; fields of, 64; relativity of, 43, 67, 76
 * Form contrasted with content, 192, 200
 * Formalism of knowledge, 175
 * Foucault's pendulum, 152
 * Four-dimensional order, 35, 56, 186
 * Four-dimensional space-time, geometry of, 45, 82; reality of, 181
 * Fourth dimension, 13
 * Frame, inertial, 156
 * Frames of reference, "right" and "wrong," 42
 * Freewill, 51
 * Freundlich, 212
 * Future, absolute, 50


 * Galilean potentials, 83
 * Gauge, effect on observations, 31; provided by radius of space, 177
 * Gauge-system, 169
 * Geodesic, absolute significance of, 70, 150; definition of, 75; motion of particles in, 138, 151; in regions at infinity, 157
 * Geodesic structure, absolute character of, 155, 164; acceleration of, 195
 * Geometrical conception of the world, 176, 183
 * Geometry, Euclidean, 1; hyperbolic, 47; Lobatchewskian, 1, 9; natural, 2; non-Euclidean, or Riemannian, 6, 73, 84, 90; non-Riemannian, 169; semi-Euclidean, 47
 * Ghosts of stars, 161
 * Globe of water, limit to size of, 148
 * Gravitation, Einstein's law of, differential formula, 90; integrated formula for a particle, 97; macroscopic equations, 140, 193
 * Gravitation, Newton's law of, ambiguity of, 93; approximation to Einstein's law, 103; deflection of light, 109, 111
 * Gravitation, propagation with velocity of light, 94, 147; relativity for uniform motion, 21, 125
 * Gravitational field of Sun, 97; deflection of light, 107, 118, 207; displacement of spectral lines, 129; motion of perihelion, 122, 206; Newtonian attraction, 102; result of observational verification, 126
 * Grebe and Bachem, 130
 * Greenwich, Royal Observatory, 114
 * Gyro-compass, 152


 * Hummock in space-time, 97
 * Hurdles, analogy of counts of, 104
 * Hyperbolic geometry, 47