The Unit of Candle-power in White Light

Paterson, C.C.; Dudding, Bernard P.

doi:10.1088/1478-7814/27/1/320

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1923

1940

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“…The following facts are offered as evidence in this connection I. The step-by-step or cascade method has been used (13) to compare the candlepower of a lamp at 1,950°C. with that of a lamp at 1,610°C. with six intermediate steps.…”

Section: Thenmentioning

confidence: 99%

Visibility of radiant energy

Gibson¹,

Tyndall²

1923

SCI. PA. NATL. BUR. STAND.

125

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Section: Thenmentioning

confidence: 99%

Visibility of radiant energy

Gibson¹,

Tyndall²

1923

SCI. PA. NATL. BUR. STAND.

125

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The Physical Realisation of the C.I.E. Average Eye

Winch

MacHin

1940

Transactions of the Illuminating Engineering Society

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After a brief historical survey of attempts at the realisation of a physical eye of defined spectral sensitivity, the earlier methods and technique employed are appraised. Subsequently, the problem is stated, both from the theoretical and practical aspects. The main treatment of the paper deals with the description of the multi-purpose apparatus which the authors have developed and which is suitable for use as an “average eye,” as defined by the Commission Internationale d'Eclairage. It can be adapted for use as a physical colorimeter indicating directly the C.I.E. trichromatic coefficients of coloured light and as an instrument for measuring spectral luminosity distribution in terms of the proportion of the total luminosity in each of 8 defined spectral bands. Finally, the possible general application to commercial photometry, colorimetry and colour rendering measurements, is discussed.

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The Unit of Candle-power in White Light

Abstract: Assuming a ratio ofof 0.85 end 0.79 fo; carbon and tungsten filaments respectively, the approximate watts per candle me obtained for any value of lumens per matt by dividing the lattcr into 10.7 for carbon slament lamps, and 10.0 for tungst,en filament lamps.

Cited by 2 publications

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Visibility of radiant energy

Visibility of radiant energy

The Physical Realisation of the C.I.E. Average Eye

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