Agfa motion picture topics (Apr 1937-June 1940)

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Supi'VMtte Films Imrintlintj of 200-Inch Lons By Glenn NE of the greatest engineering projects of our time is being quietly carried out in the shops of the California Institute of Technology in Pasadena. It is the construction of the huge telescope — the largest ever built — for the Mt. Palomar observatory, and the grinding of its great 200-inch reflecting lens. Not only is it the biggest task of its type ever attempted, but it is one requiring incredible mechanical and optical precision. The optical curvature of the 17-foot lens must be perfect within a matter of millionths of an inch — and the mechanical tolerances to which the mirror and its mount are Edgerton being built are almost equally precise. During the last few months it has been my privilege to have been allowed to make an educational motion picture of the grinding of this lens. In making it. I have tried to bring to the classrooms of our schools and colleges a vivid as well as an instructive picture of this most spectacular example of applied optics. Telescope-making on such a scale occurs but seldom — perhaps only once in a generation; and I feel fortunate indeed that the authorities of the California Institute of Technology, who are making the telescope, and of the Rockefeller 11