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Gilbert light experiments for boys (1920)

Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 89

An illustration from Gilbert light experiments for boys, 1920, leaf 89
Fig. 132. Spotting submarines 86 GILBERT BOY ENGINEERING

Light · Scientific recreations

Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.

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