Stop, in lens, 244; iris, 249; use of, 244. Sun-dial of Ahaz, 410. Syntonic transmission of wireless messages, 143. Talking-machines, 310. Tapper in wireless telegraphy receiver, 141. Tappet arm, 205. Telegraph, electric, 127; insulator, 133 ; needle, 128 ; recording, 133; sounder, 132. Telegraphy, high-speed, 135; wireless, 137. Telephone, 147; Bell, 148 ; circuit, double-line, 155; circuit, general arrangement, 152 , 153; exchange, 154 , 155. Telephony, submarine, 157. Telescope, 257; Galilean, 259 ; prismatic, 260 ; reflecting, 260; terrestrial, 259 .
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