Dyer at Cassegrain focus of the Hooker 100-inch telescope, peering into eyepiece; spectrograph is attached to telescope. Mount Wilson Observatory. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Cassegrainian telescopes Reflecting telescopes Large astronomical telescopes Spectrograph Astronomers Scientists Astronomical instruments Astronomical observatories Mount Wilson Observatory Mount Wilson (Calif.) Photographic prints. (gmgpc)
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