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292
POPULAR ASTRONOMY.
T.
Telescope, 18, 43.
Telegraph, electric, used to find longitude, 65.
Temperature affects length of metal bars, 47; how compensated for, 48.
Tides, 269.
Torsion balance, 261.
Transit instrument, 23, 39.
Transit, 145; of Venus, 145, 169.
Triangulation, 46, 50, 80.
Trigonometrical survey, 46.
Tycho Brahe, his theory of the motions of the planets, 97.
V.
Variation, moon's, 230.
Velocity of, 208.
Venus, motion of, 91; phases of, 98; transit of, 145, 169.
Vertical, 15, 45.
W.
Weight of earth, 266; of sun, 266; of planets, 268; of moon, 269.
Wires of telescope, 18.
Z.
Zenith, 35.
Zenith Sector, 55, 82, 122.
COWELL'S STEAM PRESS, IPSWICH.
