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The instrument in question, known as the interferometer, had previously yielded a remarkable series of results when applied in its various forms to the solution of fundamental problems.
He also showed how the same principle could be applied to the measurement of star diameters if a sufficiently large interferometer could be built for this purpose, and developed the theory much more completely than Stéphan had done. A year later he measured the diameters of Jupiter's satellites by this means at the Lick Observatory. But nearly thirty years elapsed before the next step was taken.
In my absence Craig had set to work on a peculiar apparatus, as though he were distilling something from several of the cigarette stubs which he had been studying by means of the interferometer. "Here's your confounded cat," I ejaculated, as I placed the unhappy feline in a basket and waited patiently until finally he seemed to be rewarded for his patient labours.
Its angular diameter, measured at Mount Wilson by Pease with the 20-foot Michelson interferometer on April 15, 1921, is 0.022 of a second, in close agreement with Russell's predicted value of 0.019 of a second. The mean parallax of Arcturus, based upon several determinations, is 0.095 of a second, corresponding to a distance of 34 light-years.
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