Crystal Palace International Electric Exhibition 1881-82

59 telegraph engineer to the Company from October, 1845. Essential parts of Mr. T. Forster’s Original Wire-covering Machine. Origi- nal Specimens of the first Wire covered in England with gutta- percha ; of Gi’ooved Board for protecting same in tunnels; of the first Submarine Wire made and used under the sea itself; Movable Studs and Coils for use in. time of earth-currents; Lightning Protector; Compound Needle; Platinised Graphite Battery ; Brown Stone and White Porcelain Insulators; Single- strokes and One-stroke Bells ; Original Commutator for time signals; Original Galvanometer and Electro-Magnetic Sema- phores, and the actual Semaphore established and now in use for train signals on the block system; Time-table; Single Needle Instrument and Book of Message Forms for the Princess Alexandra royal train ; pair of Train-describers complete ; Original Distant- signals Repeater; Original System of Inter-communication between passengers, guards, and drivers. North Nave. 163.—Waterlow & Sons, Limited, 25, 26, 27, Great Winchester- Street, London Wall, and Finsbury Stationery Works, London, E.C. Every description of Endless Telegraph. Printing Papers as used for the Morse and other telegraphic instruments. Morse Paper, in reels, 8-in. diameter and 2-in. spindle, various widths, as supplied to Hex* Majesty’s Post Office, and to the principal telegraph companies of the world. Paper for the Wheatstone Instrument, plain and oiled. Recorder Printing Paper for the electric automatic printing instruments. The Exchange TelegTaph. Company's Instrument, printing in plain type, can. be seen in operation. Eastern Gallery and South Nave. 164.—Messes. Winter & Craik, Madras Railway Company, 61, New Broad Street, London. Single-wire Block Telegraph. Instruments, with, connected outdoor signals for woi’king single or double lines on the block system. The combined action of two signalmen is required to alter the indications of the instru- ments and signals. The instruments indicate whether the line is “ clear ” or “ blocked,” and, if “blocked/’ show in what direction the train is travelling. The outdoor signals being connected with the instruments, the condition of the line, “clear” or “ blocked/-’ is made plain to enginemen. A train, leaving A for B station, itself puts the outdoor signal at A to danger, and this signal remains unalterable by either signalman himself, until the ai’rival of the train has been signalled from B to A, and “line clear'’'’ has again been asked for and obtained. Makers, Messrs. L. Clark, Muirhead, & Co., 23, Regency Street, London. Railway Corridor. 165.—Zanni & Co., 47, Holborn Viaduct, E.C. (Agent, Mr. F. Bertram.) Electric Bells, Magneto-Electric Telegraph Apparatus, Switches, &c. &c. West Corridor. aBOH