Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 264
ay one foot. The lamp is then movedback and forth until a position is found in which the greasedspot is as bright as the remainder of the paper. If this distanceis 3 ft., the lamp at 3 ft. is throwing as much light on the screenas the candle at i ft. Therefore, since the intensity of the lightis… … FIG. 179. — Bunsens photometer. darker than the remainder of the paper, because more lightpasses through the greased spot than through the paper. If itis viewed by transmitted light, the greased spot is brighter thanthe paper, for the same reason, that is, more light passes throughthe greased spot…
Physics · Home Economics
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