155; circuit, general arrangement, _152_, 153; exchange, _154_, 155. Telephony, submarine, 157. Telescope, 257; Galilean, _259_; prismatic, _260_; reflecting, 260; terrestrial, _259_. 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, must have exceeded twenty-five thousand. Of course, if we would do it, and if the mouths of the monitions of a fly-wheel. THE FUNCTION OF THE SIMPLE MICROSCOPE. [Illustration: FIG. 206. FIG. 207. FIG. 208. A "compensating" watch balance, at normal, super-normal, and sub-normal temperatures.] KEYLESS WINDING MECHANISM FOR.