Wall telephone, 1880-1920
1880-1920
Demonstration radio receiver
1926
Experimental microphone, 1878-1890
1878-1890
Experimental carbon block microphone, 1878-1890
1878-1890
Silicon crystal for wireless telegraphy, mounted in a locket, 1906-1916
1906-1916
Experimental microphones with carbon pencils and cups, 1878-1890
1878-1890
Granular microphone in glass tube, 1878-1890
1878-1890
Coherer with coarse brass turnings, 1894
1894
Filings coherer, glass tube with side pocket mounted on cylindrical rod with brass screw terminals at ends, 1894-1904
1894-1904
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
Marconi coherer and Admiralty pattern decoherer, 1900-1910
1900-1910
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
Filings coherer, Lodge pattern with two wires inserted into bulb at one end, 1894-1904
1894-1904
Henley's magneto electric double needle telegraph, 1848-1852
1848-1852
Single-needle telegraph by W. F. Cooke, 1840-1860
1840-1860
Specimens of Pacific cable in glazed presentation case, 1902-1923
1902-1923
Clark's block signalling telegraph instrument, 1854
1854
Hand perforator and copy stand for Wheatstone automatic telegraph system, 1890-1910
1890-1910
Vulcanite telephone wire insulators, 1850-1870
1850-1870
Wheatstone's portable ABC telegraph, 1858
1858
Henley needle galvanometer, 1855-1860
1855-1860
Experimental model of Marconi's magnetic detector, 1900-1910
1900-1910
Filings coherer, Lodge pattern, 1895-1900
1895-1900
Morse tape on which signals were recorded by means of a coherer, 1900
1900
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
Wheatstone printing telegraph, 1841
1841
Filings coherer, glass tube almost of taper shape, 1894-1904
1894-1904
Filings coherer, Lodge-Muirhead system, 1900-1910
1900-1910
Letter opener with calendar and map, 1893-1894
1893-4
Morse key, 1850-1870.
1850-1870
Filings coherer, glass tube formed into T-shape at one end and bent round into U-shape at other end with bulb, 1899
1899
Coherer, ebonite, with adjustable contacts, 1890-1896
1890-1896
Coherer, narrow-bore glass tube, 1894-1904
1894-1904
Filings coherer, small glass tube with bulb at one end, 1894-1904
1894-1904
Cooke and Wheatstone's four needle telegraph, 1838
1838
Spiral spring coherer, 1890-1894
1890-1894
'Italian Navy' detector, 1899-1901
1899-1901
Filings coherer, glass tube with side-pocket attached to mounting bracket, 1894-1904
1894-1904
Filings coherer, Lodge-Muirhead system, 1900-1910
1900-1910
Hertzian receiving resonator, 1890-1894
1890-1894
Wheatstone automatic tape transmitter, 1840-1860
1840-1860
Filings coherer, glass tube curved into near U-shape at one end with coil winding at other end, 1894-1904
1894-1904
Coherer, with several needles in contact with crystal, 1894-1904
1894-1904
Sample of gutta percha insulated cable, 1863-7
1863-7
Filing coherer, glass tube, fitted on to mounting bracket with terminals, 1894-1904
1894-1904
Bain's chemical telegraph, 1850.
1850