Part 106

Syphon, 132.

Tangent, 49, 73.

Telescope, 203, 204. reflecting, 204. refracting, 204.

Temperate zone, 92, 101.

Thermometer, 142.

Tides, 114, 116. neap, 116. spring, 116. aerial, 150.

Time, 105, 107. siderial, 107. equal, 107. solar, 107.

Tone, 155.

Torrid zone, 93, 147, 182.

Transit, 114.

Transparent bodies, 157.

Treble and bass, 155.

Tropics, 92.

Valve, 143.

Vapour, 17, 29, 104, 129.

Velocity, 33, 57.

Venus, 84.

Vesta, 84.

Vibration, 98, 152.

Vision, 164, 168.

Vision, angle of, 168, 170. double, 171.

Undulation, 153.

Unison, 155.

Water, 118, 130. spring, 130. rain, 130. level of, 120.

Wedge, 54, 66.

Weight, 23.

Wheel and axle, 54, 65.

Wind, 146. trade, 147. periodical, 148.