Threshing-machine, 447, 448 . Thurston, Professor, 31. Tides, 452; high, 453; neap and spring, 455. Timbre, 285. Tompion, Thomas, 412. Torricelli, 325. Trachea, 306. Train staff signalling, 216; single, 216; and ticket, 217; electric, 218. Transformation of current, 124, 176. Transmission of power, 174, 175 . Transmitter, Edison telephone, 150; granular carbon, 150, 151 . Triple-valve, 196. Trolley arm, 176. Turbines, steam, 74. Turbinia , the, 79. Tympanum, 137, 271, 272. Universal joint, 93. Vacuum brake, 189, 190 , 191 . Vacuum chamber of aneroid barometer, 330 . Valve, piston, 67;
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