American Academy of Arts and Sciences · Boston [etc.] · leaf 361
ht between the two images of the artificial star and the wedgeis moved by the pinion R till the light of the real star is matched byE, the image formed by reflection from the first surface of the plate B. The position of thewedge is then readonascale divided to twen-ty-fifths of an inch,tenths of a… … MEASURES OF FAINT STANDARD STARS. 231 Measures at Yerkes Observatory. The forty-inch refractor was used by Professor J. A. Parkhurst to measure the mag-nitudes of the stars of sixteenth magnitude, comparing them by means of the Rumfordphotometer with the standard stars of twelfth magnitude. The…
Arts · Science
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