Edison Pettit's photometer on the 60-inch telescope, Mount Wilson Observatory. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Pulfrich photometer Photometry Pettit, Edison, 1889-1962 Astronomical instruments Telescopes Mount Wilson Observatory Mount Wilson (Calif.) Photographic prints. (gmgpc)
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