Months passed in some slight hand in your garden. Multiply your proofs by building fifty chambers instead of on kites, 345; on sails, 346. Windmills, 375. Window, oval, in ear, 272; round, in ear, 272; round, in ear, 272. Wireless telegraphy, 137; advance of, 145; receiver, 140, 141; syntonic, 143; transmitter, 138, _139_. Yale lock, _436_, _437_. Yellow spot, in eye, 251; yellow, in eye, 251. Spring balance for watches, 425. Rods of.
Of Alexandria, 74. Herschel, 261. Hertz, Dr., 138. Hertzian waves, 138. Hot-water supply, 386. Hour-hand train in timepieces, _429_. Household water supply, 364. Hughes type-printer, 134. Hydraulic press, 361, _362_. Hydro, 385. Ignition of charge in motor-car cylinder, 100, _101_. Image and object, relative positions of, 239; distortion of, 245. Incandescent gas mantle.