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Description: | L.C.E. 60. (departmental catalogue number in aluminium paint) BAIRD & TATLOCK GLASGOW & EDINBURGH (stencilled in black on the maker's trade plate.). .....NS & Co. CHARCO............. (incised on the carbon rod). MANU Baird & Tatlock Glasgow and Edinburgh circa 1900 40, Renfield Street, Glasgow Scotland. DES HUGHES,David,Edward,Professor. 1878 London, England DES after BERLINER,Emile. 1876 [Washington, District of Columbia]. The United States of America. This is a Hughes loose contact carbon microphone which was important in the early development of telephony and is the forerunner of all carbon microphones. Hughes discovered the effect when he noticed a lose connection in a telephone circuit was vibrating in sympathy with the diaphragm of the telelephone's microphone. Hughes' apparatus consists of a carbon rod made from a carbon arc lamp electrode which is pointed at either end. The rod is held very loosely in two shaped carbon blocks which which have brass terminals so that the rod is can be connected to a telephonic circuit. | 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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