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Mentor (1913-1930 Crowell Publishing) Magazine 186

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    Mentor (1913-1930 Crowell Publishing) Magazine 186


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    Mentor (1913-1930 Crowell Publishing) Magazine #186
    Published Sep 1919 by Mentor Association.
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    Volume 7, Issue 14 (Serial Number 186) - September 1, 1919. Department of Science. In this issue: "The Story of the Lens" by Floyd L. Darrow. Includes Mentor Gravures of: Table Equipped For Optical Glass Grinding - Packing 100-Inch Telescope Mirror For Mt. Wilson Observatory, California - Telephotograph - Ultra-Microscope - Great Nebula In Andromeda - The Periscope. Each gravure also has educational text on the back. 7-in. x 10-in.; black and white; 12 pages on white paper plus card-stock gravures. Cover price $0.20.