Crystal Palace International Electric Exhibition 1881-82
År: 1882
Sider: 102
UDK: 621.30 : 06 (064)
DOI: 10.48563/dtu-0000189
Official Catalogue, Edited by W. Grist with Specially Prepared Plans, showing the position of each exhibitor and indicating the spaces lighted by the various sytems.
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14
Thames in 1816, and the original model of the telegraph., is
exhibited. His book, published in 1823, the first work on the
electric telegraph in the English, language, is kindly lent by
Mr. Latimer Clark, and exhibited in another part of the
exhibition.
a. Poi’tion of the original telegraph, line laid down, by Ronalds
in 1816.
6. Original model of Ronalds’ Dial Telegraph (1816).
c. “Fossil” Telegraph.
d. Insulators used by Morse.
e. Original type cast in December, 1832, by Morse.
f. Specimen of first cable between England and France, 1850.
[2.] 1837. THE “FOSSILTELEGRAPH.
The first underground practical telegraph, laid between Euston,
and Camden by Cooke & Wheatstone in 1837. It was formed of
copper wires covered with, cotton and pitch, and laid in grooves
in lengths of wood of a triangular section, the grooves being
fitted up by strips of the same material. The wood so pre-
pared was buried underground. It was used in connection with
Cooke & Wheatstone's Five Needle Telegraph.
a. “ Fossil?’ Telegraph. (1837).
&. Specimen of first cable between England and France (1850).
c. Specimen of first Atlantic cable (1858).
[8.] 1837. COOKE & WHEATSTONE'S NEEDLE
TELEGRAPH.
Five needles or magnets were employed in conjunction, with
five Schweigger’s multipliers, forming five distinct galvanometers.
Each, multiplier was connected in the circuit of a separate wire
and each needle had two movements, limited by stops, the one
movement being to the right, and the other to the left. The
alphabet was formed by the convergence of two needles simul-
taneously deflected, the. letters being engraved on the dial at the
points where the projections of the needles met. The currents
were transmitted and reversed by depressing simple commutators.
Currents from galvanic batteries were used. The five line wires
were insulated as shown in the “Fossil” Telegraph. The
instrument shown was used between Paddington and West
Drayton in 1838. This instrument, from its peculiar shape, is
known as the “ Hatchment” Telegraph.