Crystal Palace International Electric Exhibition 1881-82

61 172 ._J. Davis & Co., Tyrrel Street, Bradford, Yorkshire. Crossley's’ Electro Magnetic Telephone Receiver; Crossley's Transmitter, with magnetic bell and generator. Western Gallery. 173 —Eastern Telegraph Company, 66, Old Broad Street. Telephone Signal Apparatus for submarine intercommunication between several persons at one time. (See same Exliibitoi in. Class VI) South Nave and Eastern Gallery. 174 Edison-Gower-Bell Telephone Company of Europe, Limited, 6, Lombard Street, E.C. Telephones of various descrip- tions, and Telephonic Apparatus, jointly with the Consolidate Telephone Construction and Maintenance Company, Limited. (See also United Telephone Company.) 175 .—J. Faulkner, 13, Great Ducie Street, Strangeways, Man- chester. Double Bell, showing that residuum magnetism does not interfere with the quickest action required for telephonic oi holophonic purposes. Instrument, showing the change of centra- magnetism, caused by differences in the thickness or quality ot iron used for an armature, to a four-sided altandæ or exalted electro magnet, one side of the four being open. (A common compass-needle is used to show the change of central magnetism.) The Altandæ Electro-Magnetic Holophone, consisting ot an. altandæ electro magnet of the cricket-sounder type, with a fixed perforated armature, between which, and. the open end ot the altandæ magnet a thin iron plate is at liberty to vibrate sounds. A Holophone, with iron-covered coil and core, a magnet being- screwed to one end, the open end as before, with a fixed per- forated armature, having a thin, plate to vibrate between them. A Holophone, with magnetical poles of one kind placed around the coil, the centre iron core being connected to the other pole. Eastern Gallery. 176 ,_J. T. Gent & Co., Faraday Works, Leicester. Gent & Co.’s Patent Telephone Transmitters, with receivers and batteries complete. These transmitters are marvellously clear and distinct, and will work with any form of receiver. Western Gallery. 177 __t Gray & Son, 58, Fenchurch Street. Telephonic * , ’• Eastern Gallery Apparatus in work. J