. Carnegie Institution of Washington publication. 68 DISPLACEMENT INTERFEROMETRY APPLIED TO 61. The revolving telescope objective.—When R, in figures 94 and 9$,ro- tates, mere flashes of light would be seen at T if stationary, and the fringes would be invisible as they move broadsides on. Hence to study these phenom- ena I first availed myself of what is virtually a rotating telescope, shown in figure 96. H is the cylindrical body of a small electromotor, clamped at the foot F, and B is the horizontal shaft of the armature. To this axle the disk DD, about a foot in diameter, is attached in fro
. Carnegie Institution of Washington publication. 68 DISPLACEMENT INTERFEROMETRY APPLIED TO 61. The revolving telescope objective.—When R, in figures 94 and 9$,ro- tates, mere flashes of light would be seen at T if stationary, and the fringes would be invisible as they move broadsides on. Hence to study these phenom- ena I first availed myself of what is virtually a rotating telescope, shown in figure 96. H is the cylindrical body of a small electromotor, clamped at the foot F, and B is the horizontal shaft of the armature. To this axle the disk DD, about a foot in diameter, is attached in front and well balanced, capable, therefore, of rapid rotation. DD carries the objective P of the telescope, embedded near its outer edge, P' being a suitable counterpoise at the same distance from the axis B. The eyepiece E and tube of the telescope are carried by the ring GG, capable of rotating about the rear end of the cylindrical bcdy of the motor and to be put in any desirable position by a set-screw, as at c. E is thus stationary and the telescope is complete when E and P are temporarily coaxial. The fringes, when found in the interferometer, figures 94 and 95, without compensator, may be at any angle to the horizontal, and it is of ten troublesome to change their inclination. Hence the eyepiece E is to be set so that the. 0$ R 3 4 V 6 6/ xV e A. 6 ^ V X 97 / /. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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