. Carnegie Institution of Washington publication. 57. Apparatus. Michelson interferometer.—The interferometer first usedwas of the same form as that described above (§ 2, fig. 3), B, figure 70, beinga heavy iron block, i foot in diameter and inches thick, on which themirrors M, N (the latter and preferably both on micrometers) are securelymounted with the usual direct rough and elastic fine adjustment for hori-zontal and vertical axes. A beam of parallel white rays L arrives from acollimator (not shown) and impinges on the half-silver plate H, to be reflectedand transmitted at a convenient
. Carnegie Institution of Washington publication. 57. Apparatus. Michelson interferometer.—The interferometer first usedwas of the same form as that described above (§ 2, fig. 3), B, figure 70, beinga heavy iron block, i foot in diameter and inches thick, on which themirrors M, N (the latter and preferably both on micrometers) are securelymounted with the usual direct rough and elastic fine adjustment for hori-zontal and vertical axes. A beam of parallel white rays L arrives from acollimator (not shown) and impinges on the half-silver plate H, to be reflectedand transmitted at a convenient angle 6 (about 60°), thus furnishing the twocomponent beams which are to traverse the limbs of the U-tube. 107 108 THE INTERFEROMETRY OF The vertical columns of this tube are shown at C and C (with accessorymirrors removed), and they are joined to the capillary tube p near the bottomof C and C. Details will be given in connection with figures 71 and 72. The ray HM strikes a mirror symmetrically at 45° to the vertical below C,is thence refl
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