Crystal Palace International Electric Exhibition 1881-82

48 Multiple Junction Box; Single Junction Box; T Junction Box; Coil of Bessemer Steel Wire Mooring Rope; Firing Arc; Con- verging Arc; Low Resistance Cells (latest War Office pattern) with porus cell; High Resistance Cells; Post Office pattern large size Resistance Bridge; Chatham Sounder; Testing Table for 7 mines ; Shutter Box for 7 mines. South Nave. 114 .—S. Vyle, 22, Borough Road, Middlesboi’ough. By means of the delicate Differential Galvanometer exhibited, two tests are taken indicating the resistance of the metallic circuit, and also when the conductor is connected to the earth. Should the latter very greatly exceed the former it is evidence of its faulty con- dition, and, beyond a certain margin, would need seeing to. This conductor is spoken of by high authorities as being the only really scientific one yet invented. The galvanometer is also specially suited for testing electric light, conducting wires, and apparatus. Gallery at back of Concert-Room. Class VI.—Telegraphs, Signals, and allied Apparatus. 115 .—Her Majesty’s Government (Postal Telegraph Depart- ment). (See p. 11 et seq.) North Nave. 115a.—Her Majesty’s Government (War Office). (See p. 26 et seq.) North Nave. 116 .—A. Apps, 433, Strand. Bagot's Patent Colliery Signals, and Vinery or Hothouse Safety Apparatus; applicable also as a Fire-alarm Apparatus; increase or decrease of temperature being instantly telegraphed to the central station. Pair of Morse Sounders for ordinary telegraphic purposes. Series of Contact Pushes and Electric Bells, as employed in mansions, club-houses, and ordinary houses. Wheatstone’s Bridge, Resistance Coils, &c. &c. North Nave. 117 . Automatic Telegraph Company, Limited, 4, Ludgate Circus, E.C. Automatic Type Printing Instruments, worked on a single line wire, for distributing genera], parliamentary, and sporting news, and Stock Exchange quotations. The exhibit comprises a complete system of apparatus at woi’k : i.e. Central Station Transmitting Instrument, and a number of . Receiving Instruments, which print automatically on paper-slip in bold Roman-type characters. South Nave.