THE TROUVE MULTIPLE TELEPHONE.

Globe, Volume IX, Issue 1247, 6 March 1878, Page 3

THE TROUVE MULTIPLE TELEPHONE.

The "Scientific American" gives a description of an improved telephone invented by M. Trouve, the well-known French electrician, who has lately submitted to the French Academy of Sciences an account of experiments conducted by him upon the Bell telephone, the objecL being to increase (he capabilities of that apparatus and to render it available over any distance, however long. Instead of the single vibrating diaphragm used by Professor Bell, M. Trouvu substitutes a cubical chamber, each face of which (with one exception) is a vibrating membrane. Each of these membranes, being thrown into vibration by the same sound, influences a fixed magnet and electric circuit, the same as in the Bell arrangement. By associating all these currents, a combined current of single intensity proportional to the number of magnets influenced is produced. Instead of the cube, a polyhedron having an indefinite number of vibrating membranes may bo u&ed, and thus intensity augmented as desired. Suppose now a line established on which is disposed a telephone constructed as above described, the membranes, and magnets of which are divided into two series, and the. circuits so arrangi d that, by pronouncing a, word, currents are produced on the same wire in opposite directions. When a despatch is received to be transmitted further on, the operator talks in the telephone in the usual way ; and his speech, by the arrangement of circuits abovo noted, is heard both at the station to which he is forwarding the message and also at tho ono from which the message was sent, so that the possibility of error is thus rendered nil. M. Trouve' lias adapted this apparatus to his military telegraph.