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  • Description: Rheostats
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    • Ultra-violet photometer

    • Manufacturing process of acetate rayon
    • View of a new ultra-violet photometer, developed by DuPont scientists, shows the two sampling tubes running between the box at left, which encloses the light source, and the housing at right for two photo-electric cells with their rheostats and...
    • DuPont Magazine [December 1913]

    • Periodicals; Chemical industry; Explosives; Dynamite;
    • Table of Contents: Merry Christmas; Protect America's Game; Blasting an Ocean Channel; Progress in Explosives Transportation; Storage Outside City Limits; Farming with Dynamite; Sport at the Traps; Rheostats as Money Savers; Women Shooters Win.

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