  - Acceleration, 73, 77
- Almagest, 53
- Anchor escapement, 120
- Ancient science, 50
- Aristotle’s ideas, 23, 52
- Attwood’s machine, 83
- Babylon, temple of, 24
- Balance wheel, 159
- Candles to measure time, 46
- Chaldean day, 15
- Chaucer, 56
- Chronographs, 179
- Chronometer, 165
- Chronometer escapement, 166
- Clock movement, 123
- Copernicus, 56
- Crossbow experiment, 183
- Crown wheel, 115
- Cycloid, the, 109
- Dante’s Inferno, 54
- Day, length of, 29
- Dead beat escapement, 135
- Density, 12
- Driving weight, 127, 141
- Earth, a sphere, 21
- Earth’s motion, 57, 69
- Earth not at rest, 67
- Egg-boiler, 43
- Electric clocks, 179
- Epicycloidal wheels, 191
- Escapements, anchor, 120
- crown, 115
- chronometer, 166
- dead beat, 135
- gravity, 169
- Falling bodies, laws of, 62
- Force, 76
- Forces, revolution of, 89
- Fusee, the, 117
- Galileo’s “Dialogues,” 58
- clock, 111
- Grandfather’s clock, 119
- Gravity, action of, 13, 65
- Gravity escapement, 169
- Greek day, 16
- Harmonic motion, 97
- Hooke’s law, 71
- Isochronism of springs, 93
- Lamps to measure time, 46
- Latitude and longitude, 161
- finding, 163
- Mass, nature of, 10
- Mercury clock, 45
- Modern methods, 177, BRADBURY, AGNEW, & CO. LD., PRINTERS, LONDON AND TONBRIDGE.
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