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Bulletin of the Bureau of Standards Volume 6 pdf

Bulletin of the Bureau of Standards Volume 6 pdf

Bulletin of the Bureau of Standards Volume 6 by United States National Standards
Bulletin of the Bureau of Standards Volume 6
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Author: United States National Standards
Page Count: 148 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Format: Pdf
ISBN: 9781236150356
Download Link: Bulletin of the Bureau of Standards Volume 6
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 Excerpt: ...with a diaphragm 85, 1,, --., 6-8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2. 2.6 2.8 3.0 3.2 3.4/1 having an opening 8 mm wide to insure that, whatever the adjustments in the lamps, the same area of prism face was covered by the two filaments. In this manner it was hoped that in varying the adjustments, the same ratios of intensities would be maintained after correcting for variation in sensibility of the bolometer. But the curvature of the carbon filament did not admit uniform illumination of the prism face, so that while the ratios for various adjustments gave parallel curves (Fig. 11, a and b) an additional factor would have to be introduced in order to superpose the curves. This, however, has nothing to do with the present question of the rapid increase in the ratios as we leave the visible spectrum. In Fig. 10 are given the spectral distribution of energy of a treated carbon and a "series" tungsten lamp having filaments about the same diameter. The wave-length of maximum emission of the carbon lamp was X max = 1.48/1 a d of the tungsten lamp it was l max = 1.43/1. Beyond 2.5// the curves are not com 1 Q! i 1! 1 1 1 i 1.5 2.5 3.5 V parable on account of the absorption of the glass bulb. The observations on the tungsten lamp were multiplied by a common factor which reduced the intensities to equality at 0.58/1. Here the deflections are small, and while the errors of observations are large, the effect is insignificant in the energy curve. At 0.75/1 the energy curves already depart from equality by about 5 per cent. Here the errors of observation are small because of the large deflections which are at least 5 times those at 0.58/1. In three series of measurements made on different carbon lamps, the energy curves showed an abnormal rise in value at 0.75/1...

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