Cutaway drawings by Russell Williams Porter: prime-focus observing position and pedestal supporting plateholder. Hale observatories catalog print no. 363. The drawing is titled: "The prime focus housing and pedestal, 200 inch telescope". The drawing shows an astronomer leaning over and looking through the focus, seated inside the observatory dome. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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