Drawing by R. W. Porter depicting an interior view of Mount Palomar Observatory and a cross-sectional view of the 200-inch telescope, with parts labelled, 1938
Doheny Memorial Library, Los Angeles, CA 90089-0189 Public Domain. Release under the CC BY Attribution license--http://creativecommons.org/licenses/by/3.0/--Credit both “University of Southern California. Libraries” and “California Historical Society” as the source. Digitally reproduced by the USC Digital Library; From the California Historical Society Collection at the University of Southern California Send requests to address or e-mail given USC Libraries Special Collections specol@usc.edu
Description
Photograph of a drawing by R. W. Porter depicting an interior view of Mount Palomar Observatory and a cross-sectional view of the 200-inch telescope, with parts labelled, 1938. The telescope is illustrated cut away along a vertical plane through the polar axis. At the bottom of the picture, the ground floor of the observatory is visible. In the center of the image, the 200-inch telescope is seen pointed upright, supported by a slanted tubular base. To the left of center, a phantom drawing shows how the observer gets on and off the prime focus tube atop the telescope. Surrounding the telescope is the cross-sectional view of the dome and its shutter openings. Photoprint reads: "The 200-inch telescope. This drawing, by Russel W. Porter, associate in optics and instrument design, California Institute of Technology, shows the 200-inch telescope, cutaway along a vertical plane through the polar axis. The tube weighs about 140 tons, the entire instrument 500 tons, and the rotating dome, 1000 tons. The telescope, to be located atop Palomar Mountain in Southern California, will be completed early in 1947. Area of sky to be photographed will be quite small, say a patch having a dimension from 1/5 to 1/3 that of the full moon. Considered as a camera, the telescope will have a "speed" of F/3.3".
Type
image
Format
1 photograph : photoprint, b&w 26 x 21 cm. photographic prints photographs art
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