Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 16
see a beautifulpicture on the paper GILBERT LIGHT EXPERIMENTS 13 … Fig. 14. Spherical waves andstraight rays ture, cover the pinhole, arrange theplate or film in position, uncover thepinhole for a short time, cover it, anddevelop your negative as usual. SOMETHING ABOUT LIGHT Now, boys, before we go any furtherlet us get some clear ideas about light. Light is that…
Light · Scientific recreations
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