Engineering by Land and Sea.

Progress, Volume VI, Issue 5, 1 March 1911, Page 578

Engineering by Land and Sea.

Wireless. (From Our Own Correspondent.) Paris, December 23, 1910. In the main hall of the "Societe des Ingenieurs Civils de France" yesterday afternoon a distinguished company watched a demonstration by Professor Cerebotani, of Rome, of some new apparatus in connection with telegraphy, and more especially wireless telegraphy. Among those present were: M. Borde-

the officer is instantly in touch with his base, no matter how far away he may be. It is obvious that such an apparatus is of immense interest to army authorities. Then there is the little "teleimprimeur," a simple little instrument with a keyboard like a typewriter, which can be fixed to any telegraph or telephone installation. This transmits messages which appear on printed slips at the other end, but it has the advantage of being infinitely more simple than anything yet invented and, besides, can be used with wireless.

or a signature in Algiers could be verified from Paris. Curiously enough, the greater the distance the better the machine works, and as the operator at the one end uses the pencil, so automatically at the other end does the pencil trace out lines. The working of this yesterday brought murmurs of admiration and wonder from the experts present. One of the most interesting of these almost magical instruments was one planned to preserve secrecy in wireless

longue (Minister of Posts, Telegraphs and Telephones), Captain Brenaud, chief of the wireless station of the Eiffel Tower; M. Eiffel constructor of the tower; and official representatives from all the Ministries. The demonstrations were conducted by MM. Cerebelaud and Salaignac. Professor Cerebotani, who has pursued his studies for some time in Munich, has shown that the possibilities of wireless telegraphy are little short of incalculable. For instance, he has what he calls his pocket apparatus. This fits in a case little larger than a ease for field glasses, and could, therefore, be carried with ease by an officer on active service. Contact with the earth being easily established and an antenna formed by a piece of wire attached to the nearest tree,

This is interesting the railway officials in particular, since such a machine can be put at the disposal of all signal men, pointsmen, station masters, and so forth, permitting them to communicate quickly and accurately with the head office. It is also exceedingly useful for small, out-of-the-way post offices, since no special training or practice is necessary to operate it. Professor Cerebotani has also a marvellous instrument in the Telautographe, also a most simple apparatus, and one which can be fixed to any telephone or telegraph line without trouble or derangement. By this a signature, a drawing or a holograph manuscript written with a pencil fixed to a flexible carriage is copied exactly on a machine at the other end. Hence a man in Paris could sign a document in Algiers,

messages. So far a message sent out by a wireless station is received by all stations within a certain radius, though it be only intended for one of them, because the Hertzian waves sent out affect all receivers alike. This new machine, however, allows each of a large number of stations to have its indemnification number, and when the Hertzian waves are set a-going with the transmitter at a. certain number only the station bearing the corresponding number can receive the messages. All the others are cut off by a short circuit arrangement. It is impossible to describe in detail all the instruments shown by Professor Cerebotani, but it is safe to say that even the most expert of his visitors yesterday came away profoundly impressed with. what he had seen. .'.