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Description: | Mullard Registered Trade Mark Radio Valve R4 (acid etched on the glass envelope). BBC TYPE APPROVED BY THE POSTMASTER GENERAL PROTECTED BY PATENTS E204. P (stamped on the nickel plated skirt to indicated the positive connector. G (stamped on the nickel plated copper skirt to indicate the earth connector). MANU Mullard Radio Valve Company Limited. 1922 Hammersmith, London, England. DES after PERI,Francois,Captain and BIGUET,Jacques. 1915 France. This is a version of the 'R' type valve with the elements set vertically. It retains the old round lamp type envelope and pintel. It was designed for use in wireless telegraphy but was used in early radio receivers and public address amplifiers. | 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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