Galileo, 259, 325, 416. Galilean telescope, _259_. Gas, coal, 394; governor, 402; meter, 405; traps, 374; works, 394. Gasometer, 397; largest, _398_, 399. Gauge, steam, 36, _38_; water, 35, _36_. Gear, compensating, 107, _108_. Gear-box of motor cars, 110. Spot, blind, in eye, 251. Spring balance for watches, 425. Rods of Corti, 274. Ruhmkorff coil, 123.