Download ebook Displacement Interferometry by the Aid of the Achromatic Fringes, PT. [I]-IV Volume 1

Download ebook Displacement Interferometry by the Aid of the Achromatic Fringes, PT. [I]-IV Volume 1

Displacement Interferometry by the Aid of the Achromatic Fringes, PT. [I]-IV Volume 1 by Carl Barus
Displacement Interferometry by the Aid of the Achromatic Fringes, PT. [I]-IV Volume 1
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Author: Carl Barus
Page Count: 64 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Format: eBook
ISBN: 9781130787672
File size: 22 Mb
Download Link: Displacement Interferometry by the Aid of the Achromatic Fringes, PT. [I]-IV Volume 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: ...annoyance is to be avoided, sunlight or a steady light must be used. The phenomenon and the spectra were not nearly so bright as when observed with the transmitting grating, a result probably due both to the additional reflections (particularly those at the grating) and to the high dispersion. In other respects the behavior was the same as that described in Chapters I and II, though the strip of fringes for reversed spectra seemed to be somewhat broader, probably owing to the increased dispersion and hence the greater breadth of adequately homogeneous spectrum light. The linear phenomenon, moreover, consisted of two or more black lines alternating with bright, whereas a single black line was the characteristic feature above. When different strips of the grating G are used (the illumination 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 sintV--sin &. = T/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 trans...

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