On luminous efficiency and the mechanical equivalent of light

The determination of the efficiency of various forms of illuminants, and of the power expended in light production, does not appear to have received the attention it deserves in this country, nor have the labours of workers in Germany and in the United States as yet sufficed to permit of definite va...

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Bibliographic Details
Published in:Proceedings of the Royal Society of London. Series A, Containing papers of a mathematical and physical character Containing papers of a mathematical and physical character, 1907-12, Vol.80 (535), p.19-25
Main Author: Drysdale, Charles V.
Format: Article
Language:English
Subjects:
Bolometers
Convection
Lamps
Light
Light beams
Photometers
Prisms
Radiant flux density
Spectrophotometers
Visible spectrum
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Summary:The determination of the efficiency of various forms of illuminants, and of the power expended in light production, does not appear to have received the attention it deserves in this country, nor have the labours of workers in Germany and in the United States as yet sufficed to permit of definite values being adopted for luminous efficiencies, or for the mechanical equivalent of light. In what follows, an account of some observations made by Mr. A. C. Jolley and the writer, with the object of determining the mechanical equivalent of light, will be given. For this purpose an attempt was first made to find the luminous efficiencies and total consumption of some of the newer highly incandescent electric lamps; and this was followed by a direct determination by a bolometer in the spectrum.
ISSN:0950-1207
2053-9150
DOI:10.1098/rspa.1907.0069