Crystal Palace International Electric Exhibition 1881-82

52 nailing forward by electricity to any distant junction. On passing the next post it puts this signal at danger,, at the same time, by electricity, putting the signal at the previously passed post at line clear. In certain of tlie signal boxes an arrangement of clockwork is placed which shows how long the previous train has passed, and also indicates the number of trains passing the box in a day and the exact time each does so. At junctions the signals are connected with, the points which, when opened, show danger to the driver coming on the main line and clear on,to the branch, and remains so until the points are closed. Eastern Galle? y. 132.—The Exchange Telegraph Company, 17 and 18; Cornhill, E.C. Type Printing Instruments in various positions throughout the building connected by wires with the head office of the Com- pany, 17 and 18, Cornhill, and employed daily in the delivery of the Company’s financial intelligence. Type Printing Instruments similarly placed and connected with the transmitting office at 27, Regent Street,, employed by MacMahon's Telegi-aphic News Company, Limited, for the delivery of general and sporting news, and, during the session, of parliamentary intelligence. Type Printing Instruments similar to the above, with, trans- mitting apparatus complete, to show the manner of working’. (The transmitter exhibited, which is driven by an electrical motor, is capable of working 1,500 instruments simultaneously.) Domestic Signalling Apparatus, showing the method of calling for messengers, cabs, police, or giving the alarm of fire, &c., and the manner in which burglarious attempts upon premises are made to automatically summon assistance from the outside. There are now 6,496 of these instruments in use in the city of New York by the American District Telegraph. Company, and 2,938,321 calls were made thereby in twelve months. Automatic Fire Signalling Apparatus, in connection with, the latter exhibit, or otherwise, for automatically indicating the out- break and exact locality of fire. Street Fire Alarm System; the locality from which the alarm is sent being indicated by a needle upon a dial, or in an aperture of the receiving’ apparatus by the name coming into sight. (This apparatus requires but one wire for any numbei’ of alarm-posts, a return metallic circuit being unnecessary, and but one manipula- tion at either sending or receiving station.) The whole toeing patented by the Exchange Telegraph Com- pany, Limited. (See Advt., p. 114) South Nave, Eastern Gallery, and Library and Beading-Boom, fyc.