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Twenty-foot Michelson interferometer for measuring star diameters, attached to upper end of the skeleton tube of the 100-inch Hooker telescope. In the practical application of this method to the measurement of star diameters, the chief problem was whether the atmosphere would be quiet enough to permit sharp interference fringes to be produced with light-pencils more than 100 inches apart.
What a gay picture he is painting now, with his light-pencils; for in them, remember, and not in the things themselves the colour lies.
When this cap is removed the slit appears as a narrow vertical band with much fainter bands on both sides of it. Cover one of the holes, and the fringes instantly disappear. Their production requires the joint effect of the two light-pencils. Now suppose the two holes over the object-glass to be in movable plates, so that their distance apart can be varied.
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