Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 9
l slit. The best way to do Fig. 3. Shutter to darken room this is to make a solid wooden shut-ter, with tar paper on one side, tocover the whole window and makea slit in it three inches wide andtwo inches high. If the window istoo large for this, make a woodenshutter (Fig. 3) for the lower partand… … 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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