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Description: | Carbon filament lamp hanging on elegant wooden demonstration stand with electrical connections. Single loop carbon filament. Stand with brass terminals at front, thick bare wires led under base and up hanging post, finishing in thinned loops on which bulb hangs by its own slight weight. Early example of a'glow lamp'. Slightly torn oval paper label on bulb marked: '5 ?/ 11.V/ ...A'
"Swan Lamps It would be a gloomy life without the electric light bulb, but one familiar enough to our forbears. The first effective commercial 'glow lamps' were developed independently by Swan in England and by Edison in America at the end of the 1870s. Swan's lamp had a filament made of carbon formed from cotton thread treated with sulphuric acid and heated. Electricity was fed to the filament via two little platinum loops that fitted a holder designed to be screwed into a standard gas-light socket. Our picture shows an early Swan lamp on a demonstration stand, right, and a Swan Patent bulb in its holder, left. Edison's carbon filament lamp was fitted with the distinctive 'Edison screw' cap, long since standard in America and now becoming common here. Both lamps ultimately owed their operating success to the development from 1875 of the mercury vapour vacuum pump, which could remove all traces of destructive air from the glass bulb. Their commercial success was assured by the rapid development after 1878 of the electric dynamo. Potentially damaging litigation over who had priority to exploit the electric lamp was avoided by the formation of the Edison and Swan United Electric Light Company, whose joint patents secured a monopoly for the Edison-Swan lamp until 1893. The ending of this monopoly coincided with the widespread introduction of electric light into commercial premises."
Author: Reid,John.S Date: 1992 Purpose: University.Newsletter | License: | http://www.abdn.ac.uk/historic/Copyright_terms_conditions.shtml | Publisher: | ABDNP University of Aberdeen, Natural Philosophy Collection of Historical Scientific Instruments | Rights holder: | 47718 | Temporal: | 1875-1890 | Source: | University of Aberdeen | Creator: | stand 210 mm high x 75 mm wide x 120 mm deep; bulb 47 mm diam | Identifier: | http://calms.abdn.ac.uk/Geology/dserve.e... | Go to resource |
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