Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 123
tric lights as shown in Fig.182. The doorway between two rooms is covered by two heavycurtains and the 8-inch lens in a ring holder is inserted in ahole in a piece of cardboard and pinned between the two cur-tains. A black book stands 10 inches from the lens, and is illu-minated by two strong… … Screen, and if now you Fig. 184. You illustrate the camera GILBERT LIGHT EXPERIMENTS 121
Light · Scientific recreations
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