Carnegie Institution of Washington Publication Volume 249, PT. 1.cCarnegie Institution of Washington
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Author: Carnegie Institution of Washington
Page Count: 64 pages
Published Date: 06 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130105315
File Name: Carnegie.Institution.of.Washington.Publication.Volume.249,.PT..1.pdf
Download Link: Carnegie Institution of Washington Publication Volume 249, PT. 1
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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. 1916 Excerpt: ...should not be more then 0.5 cm. wide), considerable fore-and-aft displacement at the mirror M is necessary. The adjustment for crossed rays Mn and Nm, figure 57, is subject to new conditions. In case of white light and a narrow slit, the dispersion produced by G is at least partially annulled by G' instead of being incremented; for the change of the angle of incidence here compensates the changes of the angle of diffraction. Thus if sint---sin 6v = v/D for violet and sinir--sin &-= r/D for red, and if sin iv = v/D and sin ir = r/D, then sin 6 =sin 6r = o. A sharp, white image of the slit may thus be seen for the reflection from each mirror M and N, or the images may be colored if but a part of the spectrum is reflected from M and N. The system of two gratings, G and G', tends to become achromatic. It would seem to follow, therefore, that in general homogeneous light and a wide slit would have to be used, but this introduces additional annoyances, inasmuch as the transverse axes of the spectra (sodium lines), which are to coincide, are not visible, but must be replaced inadequately by the edges of the slit. The experiment is thus (particularly in view of the faint illumination seen in the telescope) difficult, and in a laboratory not free from agitation, or in the absence of a good mercury lamp of intense homogeneous light, it did not seem worth while to spend much time on it. Moreover, a similar investigation will presently be made with a transmitting grating. In other words, in case of the rays nM, the violet is incident at a larger angle at G ' than the red, and but one color (yellow) can be diffracted along G'T, whereas in case of the rays mN violet is incident at G' at a smaller angle than red, and G' may thus be so placed that all rays are dif...
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