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Description: | Hunterian Museum G'1988.233. (typed on a self adhesive label, removed). DO NOT DIMANTLE RETURN TO M.W.T. Co LTD FOR SERVICING. (Stencilled on a metal plate). B.B.C.-MARCONI RIBBON MICROPHONE TYPE AXBT INST No. 448040 P.S. 11780A MARCONIS WIRELESS TELEGRAPHY Co LTD LONDON B.B.C. PAT. NO. 429307 (Stencilled on a metal plate). G.U. Dept. ELECT. ENGRG E 206 (stencilled on a metallised paper label). DES British Broadcasting Corporation. circa 1944 London, England. MANU Marconi's Wireless Telegraph Company Limited. circa 1950 [Soho], London. England. Large BBC AXTB type ribbon microphone used for general studio brodcasting. The A type, designed by the BBC in 1934, was a variant of RCA's ribbon microphone patented in 1931. However, the BBC had problems with its original aluminium ribbon and replaced it in the AX model. During WWII further modifications to the internal wiring AXB and changes to the permanent magnets produced the final AXBT variant by 1944. The BBC finally stopped using this type of microphone in 1959 but it has made a ressurgence in recent times.
The microphone works by having a very thin ribbon of aluminium foil in a very strong magnetic field. Sound waves impinging on the ribbon causing it to vibrate in sympathy. The vibrations disturb the magnetic field thus generating a small but continuously oscillating voltage. | License: | http://www.hmag.gla.ac.uk/spirit/rights/ | Publisher: | Hunterian Museum and Art Gallery, University of Glasgow | Rights holder: | Hunterian Museum and Art Gallery, University of Glasgow | Subjects: | SCIENTIFIC COLLECTION : | Source: | Hunterian Museum | Creator: | Hunterian Museum and Art Gallery, University of Glasgow | Identifier: | http://www.huntsearch.gla.ac.uk/cgi-bin/... | Language: | en-GB | Go to resource |
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