High frequency sliding inductance on wood base, 1900-1950
1900-1950
Wooden pillar insulators, 1900-1950
1900-1950
Stud field regulator, 1900-1950
1900-1950
Copper busbars and ebonite insulators, 1900-1950
1900-1950
Rotary convertor, 1900-1950
1900-1950
Guard lamps on wooden board, 1900-950
1900-1950
Aerial tuning inductance, 1900-1950
1900-1950
Iolanda transformer in wooden box, 1900-1950
1900-1950
Low frequency iron core inductance, 1900-1950
1900-1950
Tuning indicator with lamp, 1900-1950
1900-1950
High-frequency chokes, 1900-1950
1900-1950
Willis world clock, 1929-1935
1929-1935
'MPB' call sign plaque, 1900-1950
1900-1950
Lord Kelvin's 'ironclad' marine galvanometer, 1865-1866
1865-1866
Ring transformer, 1892
1892
A.B.C. telegraph transmitter, 1835-1845
1835-1845
Murray multiplex tape transmitter, 1910-1920
1910-1920
Cable for aerial installation, 1930-1962
1930-1962
Ashtray and matchbox holder advertising the Eastern Telegraph Company, 1901-1929
1901-1929
Machine used for covering wires with silk and cotton, 1837
1837
Specimen of Dover-Calais telegraph cable, 1851
1851
Morse key with send-receive switch, 1900-1920
1900-1920
Double-current telegraph key, 1830-1900
1830-1900
Sample of submarine telegraph cable, 1866
1866
Thomson's mirror marine galvanometer, 1858
1858
Cylinder electrical machine, 1810-1817
1810-1817
Atlantic Telegraph Cable Souvenir, 1873
1873-1920
Atlantic cable specimen, 1865
1865
Mirror galvanometer for the transatlantic telegraph, 1858
1858
Moving magnet galvanometer with dial inscribed "Greenwich Mean Time", 1843-1897
1843-1897
Sample of the first transatlantic cable, 1857-1858
1857-1858
Replica of the first Morse telegraph, 1835
1934
Siemens and Halske's ABC Telegraph used in Russia
1850-1897
Filings coherer, glass tube bent into U-shape at one end, 1894-1904
1894-1904
Filings coherer, glass tube almost of taper shape, 1894-1904
1894-1904
Coaxial cable sample, 1948-1967
1948-1967
Steljes ABC type printing telegraph receiver No. 477
1895-1910
Trough battery, 1801-1838
1801-1838
Filings coherer, Lodge-Muirhead system, 1900-1910
1900-1910
Filings coherer, glass tube containing powdered copper, bulb at one end, 1894-1904
1894-1904
Hertzian receiving resonator, 1890-1894
1890-1894
Cable grappling illustration, 1874-1924
1874-1924
Filings coherer, Lodge pattern with two wires inserted into bulb at one end, 1894-1904
1894-1904
Coherer, narrow-bore glass tube, 1894-1904
1894-1904
Magnetic key, 1850-1870
1850-1870
Filings coherer, small glass tube with bulb at one end and cap of red sealing wax at other end, 1898
1898
Filings coherer, glass tube with side-pocket attached to mounting bracket, 1894-1904
1894-1904
Filings coherer, glass tube bent into U-shape at one end with bulb to form side-pocket on mounting bracket with terminals, 1894-1904
1894-1904
Stroh's type-printer for Wheatstone ABC communicator, 1870-1881
1870-1881
Filings coherer, glass tube formed into T-shape at one end and bent round into U-shape at other end with bulb, 1899
1899