An interlaboratory photometric comparison of glass screens and of tungsten lamps, involving color differences
✍ Scribed by G.W. Middlekauff; J.F. Skogland
- Publisher
- Elsevier Science
- Year
- 1916
- Tongue
- English
- Weight
- 101 KB
- Volume
- 181
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
85I
ture was raised or the time of heating extended. In other words, an oil which had a low carbonization value if heated to 250 ° for two or three hours, and an oil showing a somewhat higher value under the same conditions, will be further and further apart as the conditions become more strenuous. This being so, it is unnecessary to greatly prolong the time of heating in routine testing.
The need of extreme care in taking and preserving samples, as well as in testing them, was emphasized, because the presence of rust particles or other extraneous matter increases the amount of carbonization.
In conclusion it is shown that the carbonization value is independent of the flash-and fire-points and of the evaporation loss on heating.
AN INTERLABORATORY PHOTOMETRIC COMPARISON OF GLASS SCREENS AND OF TUNGSTEN LAMPS, INVOLVING COLOR DIFFERENCES.*