. Carnegie Institution of Washington publication. eter is obtained. Here M and N are half-silvered plates, M and N theopaque mirrors. The white light L impinging from a collimator thus fur-nishes the two component beams o<7 and bd, which are observed with the tele-scope at T, after passing the direct-vision prism grating g. If either mirrorM or N is displaced a distance e, moving parallel to itself, the path-differ-ence ze cos 6 is introduced with the corresponding shift of ellipses. TheU-tubes C, Ct with their helices H, Hr, and connecting pipe p are now con-veniently installed as shown. B
. Carnegie Institution of Washington publication. eter is obtained. Here M and N are half-silvered plates, M and N theopaque mirrors. The white light L impinging from a collimator thus fur-nishes the two component beams o<7 and bd, which are observed with the tele-scope at T, after passing the direct-vision prism grating g. If either mirrorM or N is displaced a distance e, moving parallel to itself, the path-differ-ence ze cos 6 is introduced with the corresponding shift of ellipses. TheU-tubes C, Ct with their helices H, Hr, and connecting pipe p are now con-veniently installed as shown. But the trouble with the arrangement is thedifficulty of adjusting the four surfaces. Not only are the centers of ellipsesliable to be remote from the center of the field, but it is often hard, withoutspecial equipment, to even find the fringes. If, however, the device which I suggested in the preceding report is adopted—, if (fig. 74) the half-silvered plates M, N are at the ends of a singlestrip of plate-glass, so that rays terminating in
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