. Carnegie Institution of Washington publication. n of both mirrors of a pair, M and M for instance, by thesame amount, is required as an equivalent to the rotation of the compensator,as has been stated. The aim is to render both parallel pairs themselves x\ is eliminated from the two equations on the preceding page, i — 2A7V cos 8/eibi The above data are inadequate for evaluating M, but they neverthelessindicate a value entirely too low. It seems, therefore, as if some essentialterm has been left out of sight. This is also to be inferred from the valuesof x, which differ systemati
. Carnegie Institution of Washington publication. n of both mirrors of a pair, M and M for instance, by thesame amount, is required as an equivalent to the rotation of the compensator,as has been stated. The aim is to render both parallel pairs themselves x\ is eliminated from the two equations on the preceding page, i — 2A7V cos 8/eibi The above data are inadequate for evaluating M, but they neverthelessindicate a value entirely too low. It seems, therefore, as if some essentialterm has been left out of sight. This is also to be inferred from the valuesof x, which differ systematically on the two sides of the table 31. TABLE 32.—Refraction of a glass plate. e = cm.^ = Rotation around vertical axis. Jamintype displacement interferometer. 0 = 45°. i ANXio3 M i AWXio3 M cm. cm. + ° - 6-5° .60 - i. 20 •56 8-5 1-25 1-51 1-75 •52 6-5 .70 •56 4-5 •45 .... -14-5 3-35 •51 2-5 •05 .... •57 ± .00 .... •55 - 4-5 •30 ..... go0 90° 100° wr nor In view of the discordant results obtained here and elsewhere with this typeof rotating compensator, the provisional parts of the apparatus were improvedby mounting a more accurate graduated circle with vertical axis and tangentscrew. A good plane-parallel plate of thickness 2 = cm. and refractiveindex M=i-S3 was then adjusted normal to the ray passing through it, bynoting the position of reversal of motion of the ellipses both when the platewas rotated around a vertical and around a horizontal axis. The data oftable 32 and figure 79 were found while the plate was rotated on its verticalaxis both in a clockwise and counter-clockwise direction from the normalposition. In the former case (left side of curve) the normal position showedthe same constants before and after. In the latter this was not quite the case,the micrometer being not sufficiently refined for such purposes. The results for ju were computed fr
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