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

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Title	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
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".
Subject	Mount Palomar Observatory
Subject (adlf)	research facilities
Subject (file heading)	Observatories -- Mount Palomar Observatory
Subject (lcsh)	Observatories Telescopes Astronomical instruments
Geographic subject (county)	San Diego
Geographic subject (state)	California
Geographic subject (country)	USA
Coverage date	1938
Author	Porter, R.W.
Publisher (of the digital version)	University of Southern California. Libraries
Date created	1938
Type	images
Format (aacr2)	1 photograph : photoprint, b&w ; 26 x 21 cm.
Format (aat)	photographic prints photographs art
Accession number	42381
Call number	CHS-42381
Microfiche number	84-1-972
Legacy record ID	chs-m10562; USC-2-1-1-10710
Part of collection	California Historical Society Collection, 1860-1960
Part of subcollection	Los Angeles Area Chamber of Commerce Collection, 1890-1960
Project	USC
Rights	California Historical Society
Access conditions	Send requests to address or e-mail given. Phone (213) 821-2366; fax (213) 740-2343.
Repository name	USC Libraries Special Collections
Repository address	Doheny Memorial Library, Los Angeles, CA 90089-0189
Repository email	specol@usc.edu
Filename	CHS-42381
Full text	Phantom Drawing Showing how The Observer gets on and off the Tube Crane Traci\ Telle scope Cag-e Prime Focus Platform Dome, i37feet Diameter Dome Shutter 30 ft. opening Right Ascension Drive PASSENGER Elevator Ou'i SIDE V INSIDE Dome Balconies Coudl Focus /*3Q Constant temperature room Observatory wall Air Conditioning ducts South Polar Axis Bearing South Pier PRIME FOCUS /3-3 60 Ton Crane Coude 1? Cassegrain mirrors Horse Shoe, north Polar axis Bearing Declination Axis NORTH Pressure Bearings 200 INCH Mirror north Pier CASSEGRAIN Focus f\e NORTH Control desk Dome Drive Dome Trucks Electrical control Panels Ground Floor Observation Fijook Asove Sea levei THIS DRAWING SHOWS THE 200 INCH TE LESCOPE , CUTAWAY ALONG A VERTICAL PLANE THROUGH THE POLAR AXIS, AND AS IT APPEARS TO YOU - WITH EXPLANATORY NOTES ON THE MARGIN GIVING ESSENTIAL FEATURES OF THE ,v r--T-r^, ..ick.t THE TUBE WEIGHS ABOUT 140 TONS , THE ENTIRE INSTRUMENT 500 TONS. INS I KUWILN I . AND THE rotating dome weighs iooc tons.
Archival file	chs_Volume91/CHS-42381.tiff

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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

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