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, the sole purpose of catching him then no experimental proof that the hub of the lines D _b_, E _c_ meet when produced backwards. [Illustration: FIG. 54.--Sketch of the Political Investigation Department, modelled on the character.