Telephograph, [74]

advantages of, [76]

method of working, [96]

Telephone receiver, [83], [85]

diaphragm, [48]

improved, [51]

Telephone relay, [48], [50], [52], [83], [85], [97]

Telescope, [131], [136]

Thermodetector, [32]

Tow, [88]