Page:Relativity (1931).djvu/188

168 Quasi-Euclidean universe, 136

Quasi-spherical universe, 136

Radiation, 55

Radioactive substances, 59

Reference-body, 5, 7, 8–11, 22, 28, 31, 32, 44, 70

rotating, 94

mollusk, 118-120

Relative position, 3

velocity, 141

Rest, 17

Riemann, 102, 128, 132

Rotation, 95, 147

Schwarzschild, 158

Seconds-clock, 44

Seeliger, 125, 127

Simultaneity, 26, 29-32, 96

relativity of, 31

Size-relations, 107

Solar eclipse, 89, 153, 155

Space, 9, 62, 65, 125

conception of, 24

Space co-ordinates, 66, 96, 118

Space-interval, 36, 67

point, 118

Space, two-dimensional, 128

three-dimensional, 147

Special theory of Relativity, 1–68, 24

Spherical surface, 129

space, 132, 133

St. John, 159

Stellar universe, 126

photographs, 153

Straight line, 1–3, 9, 10, 97, 105, 129

System of co-ordinates, 5, 10, 11

Terrestrial space, 18

Theory, 148

truth of, 149

Three-dimensional, 65

Time, conception of, 24, 61, 125

co-ordinate, 66, 118

in Physics, 26, 117, 146

of an event, 28, 32

interval, 36, 67

Trajectory, 10

“Truth,” 2

Uniform translation, 14, 69

Universe (World), structure of, 128, 135

circumference of, 131

Universe, elliptical, 133, 136

Euclidean, 130, 132

space expanse (radius) of, 137

spherical, 132, 136

Value of 7, 97, 130

Velocity of light, 11, 21, 22, 89, 143

Venus, 152

Weight (heaviness), 77

World, 65, 66, 130, 147

World-point, 147

-radius, 133

-sphere, 130, 131

Zeeman, 48