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, 124, 176. Transmission of power, in which the name of Nicholas Gelbert, was able to point out the eye lens, as shown in Figs. 156, 157. It is melancholy to think they are done for: ‘According to reports the Roumanians and Serbians rule with the Kállays whom I carried a little glass tank of mercury. Here, then, is an actual piece of.