Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 363
AL ASTRONOMY from the star. If the sKts are placed in the converging coneof hght their distance apart as projected conically on theobject glass of the instrument must be used. If d is expressedin inches and a in seconds of arc, this relationship becomesapproximately a = 5/d. By this method, an… … Fig. 94.—Stellar Interferometer as used with the Mount Wilson100-inch Reflector. to increase the aperture of the telescope. This is effectivelydone, in the case of the Mount Wilson 100-inch reflector, byplacing a steel girder, 20 feet in length, across the upper endof the telescope tube. Attached…
Astronomy
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