Mazda QP.240 battery double output pentode valve (McVitie Weston valve collection), 1935
1935
'Radio at a glance' chart, 1925-1935
1925-1935
De Forest audion 1906-1915
1906-1915
S.215 dummy valve, 1920-1929
1920-1929
Cosmos crystal receiver, 1920-1930
1920-1930
Wartime civilian receiver A.C.mains type, 1944-1945
1944-1945
Wall telephone, 1880-1920
1880-1920
Demonstration radio receiver
1926
Bell telephone, mahogany case, 1878
1878
Experimental microphone, 1878-1890
1878-1890
A T & T national telephone directory, October 1896
1896
Instruction booklet for Cosmos crystal receiver, 1920-1930
1920-1930
Experimental carbon block microphone, 1878-1890
1878-1890
Loud speaker valve type L.S.5. W/T, 1923
1923
Table instrument with dial, 1903
1903
Silicon crystal for wireless telegraphy, mounted in a locket, 1906-1916
1906-1916
Home made 30-line televisor, 1934
1934
Specimen of television cable, 1936
1936
Experimental microphones with carbon pencils and cups, 1878-1890
1878-1890
National Telephone Company directory, 1898-1899
1898-1899
Granular microphone in glass tube, 1878-1890
1878-1890
Brownie crystal receiver and pair of Lissen headphones, 1924-1927
1924-1927
Strowger calling dial, 1906
1906
Gutta percha snuff box, 1820-1860
1820-1860
Mirror galvanometer for the transatlantic telegraph, 1858
1858
Filings coherer, glass tube with side pocket mounted on cylindrical rod with brass screw terminals at ends, 1894-1904
1894-1904
Coherer with coarse brass turnings, 1894
1894
Stock Exchange automatic telegraph, 1872-1880
1872-1880
Thomson's mirror marine galvanometer, 1858
1858
Syntonic Leyden jars, 1880-1889
1880-1889
Bright's bell telegraph, 1855
1855
Sample of four-core telegraph cable connecting Vancouver Island with the mainland
1904
Cable grappling illustration, 1874-1924
1874-1924
Marconi coherer and Admiralty pattern decoherer, 1900-1910
1900-1910
Aerial inductances, 1901
1901
Specimen of telegraph cable laid in Birmingham in 1856
1856
Filings coherer, glass tube containing powdered copper, bulb at one end, 1894-1904
1894-1904
Wheatstone receiver (Morse inker), 1867
1867
Cylinder electrical machine, 1810-1817
1810-1817
Filings coherer, Lodge pattern with two wires inserted into bulb at one end, 1894-1904
1894-1904
Lord Kelvin's 'ironclad' marine galvanometer, 1865-1866
1865-1866
Henley's magneto electric double needle telegraph, 1848-1852
1848-1852
Steljes ABC type printing telegraph receiver No. 477
1895-1910
Experimental form of Marconi Company magnetic detector, 1900-1910
1900-1910
Flag from Cable Ship 'Faraday' (sunk 1941), 1923-1941
1923-1941
Single-needle telegraph by W. F. Cooke, 1840-1860
1840-1860
Specimens of Pacific cable in glazed presentation case, 1902-1923
1902-1923
Hand perforator and copy stand for Wheatstone automatic telegraph system, 1890-1910
1890-1910
Wheatstone's portable ABC telegraph, 1858
1858
'Leiber's Five Letter American Telegraph Code', book issued 1915
1915