Plate holder on the Hooker 100-inch telescope newtonian cage, Mount Wilson Observatory. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Cassegrainian telescopes Newtonian telescopes Reflecting telescopes Large astronomical telescopes Astronomical instruments Astronomical observatories Mount Wilson Observatory Mount Wilson (Calif.) Photographic prints. (gmgpc)
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