. Carnegie Institution of Washington publication. 132 THE INTERFEROMETRY OF This is curve a in figure 89. From it the mean rate - = , or 27 may be found. (2) Coarse large fringes. Smaller differential glass-path. 0° ° ° ° ° ° ° ° ° ° JVXio3=-25 +29 84 134 176 217 265 323 365 420 467 cm. This is the curve given (with double ordinates for distinction) in curve b,figure 89, and in figure 90. Besides this the datum a= —°, N = — obtained. In figure 90 the mean rate is AN — - = , or Aa agreeing w
. Carnegie Institution of Washington publication. 132 THE INTERFEROMETRY OF This is curve a in figure 89. From it the mean rate - = , or 27 may be found. (2) Coarse large fringes. Smaller differential glass-path. 0° ° ° ° ° ° ° ° ° ° JVXio3=-25 +29 84 134 176 217 265 323 365 420 467 cm. This is the curve given (with double ordinates for distinction) in curve b,figure 89, and in figure 90. Besides this the datum a= —°, N = — obtained. In figure 90 the mean rate is AN — - = , or Aa agreeing with the preceding as closely as may be expected. We may thusestimate AN = 2jXio~* of displacement at the micrometer at H3 per micro-radian of turn a at the mirror m, which amounts to a little less than oneinterference ring per micro-radian (about second of arc) of turn. More-over, turns of a less than a few degrees are certainly measurable. Through- •8, -3 -4* -5° -6°
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