Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 10
Fig. 4. Shutter in window withother side showing and with card-board tacked over slit GILBERT LIGHT EXPERIMENTS 7 shape of the slit. To clo this you willmake slits of the right kind in blacktar paper or cardboard and then tackthese over the slit in the wooden shut-ter. Make the shutter so that you…
Light · Scientific recreations
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