. Carnegie Institution of Washington publication. -~~J 77 78 The first result is particularly interesting, inasmuch as it is thus possibleto displace the centers of ellipses not only horizontally as usual relative tothe fixed sodium lines in the spectrum, but also vertically relatively to thefixed horizontal shadow in the spectrum due to the fine wire across the following experiment was made to coordinate the vertical displacementof the component rays and centers of elliptic fringes: A glass plate d = thick was placed nearly normally in the beam ac, figure 74, and providedwit
. Carnegie Institution of Washington publication. -~~J 77 78 The first result is particularly interesting, inasmuch as it is thus possibleto displace the centers of ellipses not only horizontally as usual relative tothe fixed sodium lines in the spectrum, but also vertically relatively to thefixed horizontal shadow in the spectrum due to the fine wire across the following experiment was made to coordinate the vertical displacementof the component rays and centers of elliptic fringes: A glass plate d = thick was placed nearly normally in the beam ac, figure 74, and providedwith a horizontal axis and graduated arc. The amount (i) of rotation of theplate, corresponding to the vertical displacement of one central fringe in thetelescope (, passage of fringe a into b, into c, in the duplicate spectrum 5,fig. 78), was then found to be, if i is the angle of incidence, i h No fringes ° cm- One fringe ° .0214 Two fringes ° .0281 where h is the corresponding vertical displacement of the rays ac, figure 7
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