A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 165
he simplest case is thatin which the light-giving object is as small as possible. EXPERIMENT. Light a bat-wing gas-jet or a kerosene lamp with a broad, thin,flame, 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… … FIG. 89. mere point. To illustrate what would be the result if thiscould be done, the student should examine Fig. 89. Of the light-rays proceeding from the point L, the cir-cular opaque object 0V intercepts all which strike its sur-face, thus forming a shadow whose shape is in this case the NATURE…
Physics
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
