Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 107
is as small as possible. EXPERIMENT. Light a bat-wing gas-jet or a kerosene lamp with a broad, thinflame, and cast the shadow of a lead-pencil, held vertical, on a sheetof white paper, having first the edge and then the broad side of theflame toward the pencil. Note the great difference in the… … Fig. 59. could be done, the student should examine Fig. 59. Of the light-rays proceeding from the point £, the cir-cular opaque object OF intercepts all which strike its sur-face, thus forming a shadow whose shape is in this case thefrustum of a cone, OS TV.* The black space *STin thescreen is not…
Physics
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