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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.
Even the two first remained unseen save by himself until 1828, when his son re-observed them with a 20-foot reflector, similar to that with which they had been originally discovered. Thenceforward they were kept fairly within view, but their four questionable companions, in spite of some false alarms of detection, remained in the dubious condition in which Herschel had left them.
A 100-foot interferometer might be designed in many different forms, and one of these may ultimately be found to be within the range of possibility. Meanwhile the 20-foot interferometer has been improved so materially that it now promises to yield approximate measures of stars at first supposed to be beyond its capacity.
The success of this work strongly encouraged the more ambitious project of measuring the diameter of a star, and the 20-foot interferometer was built for this purpose.
Here the "length of his sounding-line" was estimated by Herschel at about 497 times the distance of Sirius in other words, the bounding orb, or farthest sun of the system in that direction, so far as could be seen with the 20-foot reflector, was thus inconceivably remote.
The people in the photo lab made a few calculations and measurements and came up with the answer, "A 20-foot balloon photographed from 30,000 feet away would be the same size as the UFO in the gun camera photos." Lieutenant Flues's Coca-Cola consumption had dropped from twenty bottles a day in mid-July to his normal five.
The two F-86's had been at about 40,000 feet when the photos were taken and the 20-foot balloon was at about 70,000 feet. Andy's question to the photo lab was, "How big should a 20-foot balloon appear on a frame of 16-mm. movie film when the balloon is 30,000 feet away?"
The 20-foot interferometer designed by Messrs. These take the place of the two holes over the object-glass in our experiment. After this the course of the light is exactly as it would be if the mirrors M2, M3 were replaced by two holes over the 100-inch mirror.
But the climax came when he managed to bug the safety catch on the foolproof ash elevator and took a 20-foot drop with about a ton of loaded ash cans. He only had a leg broken, at that, but it was three or four months before he came limpin' out of the hospital to find that the buildin' agent didn't care to have him on the payroll any more. Somehow Henry got his case before Mr.
This determination shows Betelgeuse to be 160 light-years from the earth. On December 13, 1920, Mr. Pease successfully measured the diameter of Betelgeuse with the 20-foot interferometer.
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