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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[26.] 1846. MAGNETO-ELECTRIC MACHINE, commonly
called the “ Thunder-pump/^ employed for releasing the clock-
work mechanism of an electric alarum or bell. Used "by the
Electric Telegraph. Company.
[27.] 1846. ALARUM WITH CENTRIFUGAL HAMMER.
Used in connection with Cooke & Wheatstones first needle
instruments. Moved by clockwork; driven by a mainspring;
released by an electro-magnet.
[28.] SET OF JOINTS EMPLOYED ON IRON LINE
WIRES.
1842. Cook fy Wheatstone’s.
1844. Reid’s.
1851. Clark’s “ Britannia” Joint.
[29.] 1843. WHEATSTONE'S ORIGINAL FORM OF
RESISTANCE COILS FOR TESTING.
[30.] RAILWAY SIGNALLING INSTRUMENTS.
a. 1845. Early form of Train Signalling Apparatus, devised
by Cooke, and used on the Norfolk Railway.
b. 1855. Edwin Clark’s Block Signalling Instrument, fixed on
the London and*North-Western Railway.
c. 1862. Preece’s Semaphore Signal, used on the London and
South-Western Railway.
[31.] LIGHTNING PROTECTORS.
Selection of Lightning Protectors used at different periods.
a. Latimer ClarVs Protector.
b. Henley’s Protector.
c. 8. A. Varley’s Carbon Protector, or Lightning Bridge, with,
longitudinal section of the same.
d. Varley’s Vacuum Tube.
e. Reid’s Protector.
f. Twisted Wire Protector.
g. Tube Protector, with, outer glass tube.
h. Ordinary Tube Protector used in the Post Office Telegraph
Department.
i. Comb Protector (exterior and interior).