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Description: | ROYAL "EDISWAN" 220V 16CP CARBON 41 MADE IN ENGLAND (acid etched on the glass envelope) There is also the royal crest and the crown and anchor of the Royal Navy (acid etched on the glass envelope). 220v (painted in white on the glass envelope with a red stripe). MANU Royal Ediswan circa 1925 England DES after SWAN,Joseph,Wilson,Sir. 1878 Newcastle-Upon-Tyne England DES after EDISON,Thomas,Alva. 1879 Menlo Park, New Jersey United States of America This is a 220 volt 16 candle power general lighting service lamp with a Swan double contact bayonet two pin cap type No B22/25x26 and a clear pear shaped envelope. The single filament, in the form of four loops, is attached to the copper sheathed nickel iron lead in wires by the carbon tube method and supported by three wires from a central stem. The envelope is a machine made vacuum type. Note the "metallised" carbon filament was first produced in 1904-5 and was a double heat treatment of a sqirted carbon filament giving it a glassy or metallic finish. This specimen and the other lamps on the rack had been moved from their original positions and the the type nomenclature is no longer relevant. The voltage of the lamp is also different from that stated on the rack i.e. 250v and therefore the rack was probably used simply to store an odd assortment of lamps for which it was not originally designed. | 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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