. Carnegie Institution of Washington publication. 10. The motion of a single mirror, M or N, for instance, does destroy the sym-metry, and it was shown in § 12 that the limiting range of displacement cm. moves either a or b cm. out of symmetry. The interferencesthus vanish without much changing in form or size, and vanish in all focalplanes. The breadth of the blades of light aa and bbf, figure n, capable of inter-fering is x on the grating and x cos ^ = = cm. normally. Since the rays are parallel after leaving the collimator, this wouldbe about half the breadth
. Carnegie Institution of Washington publication. 10. The motion of a single mirror, M or N, for instance, does destroy the sym-metry, and it was shown in § 12 that the limiting range of displacement cm. moves either a or b cm. out of symmetry. The interferencesthus vanish without much changing in form or size, and vanish in all focalplanes. The breadth of the blades of light aa and bbf, figure n, capable of inter-fering is x on the grating and x cos ^ = = cm. normally. Since the rays are parallel after leaving the collimator, this wouldbe about half the breadth of the effective beam on the objective of this appur-tenance. Thus 2 = 55 cm., increased by the width of the refractingedge of the prism, is the width of the strip of white light which, after separa-tion by the knife-edge of the prism, furnished the two component beams whichpotentially interfere on recombination. It is reasonable to suppose that theelements of these beams come from a common source and that the width inquestion is produc
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