. Carnegie Institution of Washington publication. rror of observation or of adjustment, but must be interpreted as the path-difference added when the pencil shifts towards the edge of the prism (x)instead of being stationary as in y. In case of inverted spectra, moreover(next chapter), % is usually in excess of z, and the shift is the other way. Thedeficiency in x, though not equally marked, is present in observations bothon the right and left sides of the prism P. 16. Breadth of efficient wave=f routs. Apparent uniformity of wave= of fringes.—It follows from figure 17 that if M
. Carnegie Institution of Washington publication. rror of observation or of adjustment, but must be interpreted as the path-difference added when the pencil shifts towards the edge of the prism (x)instead of being stationary as in y. In case of inverted spectra, moreover(next chapter), % is usually in excess of z, and the shift is the other way. Thedeficiency in x, though not equally marked, is present in observations bothon the right and left sides of the prism P. 16. Breadth of efficient wave=f routs. Apparent uniformity of wave= of fringes.—It follows from figure 17 that if M is displaced to Mf,over a distance e, the pencil b is displaced parallel to itself over 5 = 2e sin 5/2 where 5 = 90°— 6. The pencil c is then displaced parallel to itself over adistance t = s tan (f>/2 = s since 0 = 49° 45, 6/2 = 20° 7, and therefore 5 = = ^, the rotation of fringes is but 90°, either 5 (or 5/2) is also the breadth ofthe strips, or patches of like origin, which, when sliding over each other more.
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