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A yellow glass filter for colour-temperature measurements
A yellow glass filter for colour-temperature measurements
- Source :
- Proceedings of the Physical Society. 56:21-30
- Publication Year :
- 1944
- Publisher :
- IOP Publishing, 1944.
-
Abstract
- A glass filter is described which enables the colour temperature of lamps to be measured, using standard lamps which operate at lower colour-temperatures. The filter is yellow in colour and made from Corning 346 and 507 glasses. The method of construction is described. Colour-temperature measurements made with the glass filter agree to 4°k. with those using the blue liquid filter previously used at the laboratory. The advantages of the yellow filter over the blue filter are that the yellow filter is more stable, the colour-matching properties are better, the energy match is better for a colour match, the temperature coefficient is a fifth of that of the blue filter, and the yellow filter is placed in front of the brighter lamp, so that, for a colour match, the lamps are nearly equidistant from the photometer. The properties of glass filters made from (a) a yellow glass with Zeiss U.G.3, (b) Corning 346 with Chance O.V.2, and (c) Cobalt blue glass are mentioned.
Details
- ISSN :
- 09595309
- Volume :
- 56
- Database :
- OpenAIRE
- Journal :
- Proceedings of the Physical Society
- Accession number :
- edsair.doi...........c8a158f2ed50f7190b99f2f8678956fc
- Full Text :
- https://doi.org/10.1088/0959-5309/56/1/304