Dr. Robley C. Williams (in shirt sleeves), of the University of Michigan, giving a final rub to the 82in mirror for the reflector telescope of the new McDonald Observatory in West Texas. During the past four years optical specialists have been grinding and polishing the mirror until it acquired a parabolic surface ivith a deviation of less than one-twentieth of a light wave, or approximately one millionth of an inch. The minor is the second largest in the world, is made of pjrex glass, is twelve inches thick % and weighs three tons.
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Bibliographic details
Evening Post, Volume CXXVI, Issue 132, 1 December 1938, Page 17
Word Count
92Dr. Robley C. Williams (in shirt sleeves), of the University of Michigan, giving a final rub to the 82in mirror for the reflector telescope of the new McDonald Observatory in West Texas. During the past four years optical specialists have been grinding and polishing the mirror until it acquired a parabolic surface ivith a deviation of less than one-twentieth of a light wave, or approximately one millionth of an inch. The minor is the second largest in the world, is made of pjrex glass, is twelve inches thick% and weighs three tons. Evening Post, Volume CXXVI, Issue 132, 1 December 1938, Page 17
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