Light: A Series of Simple, Entertaining, and Inexpensive Experiments in the Phenomena of Light, for the Use of Students of Every AgeD. Appleton, 1877 - 112 páginas |
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Página 30
... screen , upon a table . Near it is a bit of square paper , fastened to the end of our needle - pointed awl , and beside this is a lamp , and next to the lamp is a postal - card , having a slit cut in it near the top . On the screen you ...
... screen , upon a table . Near it is a bit of square paper , fastened to the end of our needle - pointed awl , and beside this is a lamp , and next to the lamp is a postal - card , having a slit cut in it near the top . On the screen you ...
Página 32
... screen . Look carefully at everything , and have the paper just on a level with the slit in the postal - card , and have the lamp , paper , and screen , just in line , and then the square shadow will appear sharp and clear on the white ...
... screen . Look carefully at everything , and have the paper just on a level with the slit in the postal - card , and have the lamp , paper , and screen , just in line , and then the square shadow will appear sharp and clear on the white ...
Página 35
... screen . Beyond this is a lamp , placed upon a pile of books , so as to bring the FIG . 7 . flame of the lamp on a level with the flame of the candle . The lamp should stand , say , at 44 inches ( 112 centimetres ) from the screen ; and ...
... screen . Beyond this is a lamp , placed upon a pile of books , so as to bring the FIG . 7 . flame of the lamp on a level with the flame of the candle . The lamp should stand , say , at 44 inches ( 112 centimetres ) from the screen ; and ...
Página 36
... screen than the other . Measure off the distance . Perhaps the candle is 22 inches ( 55.8 centimetres ) from the the screen , and the lamp is 44 inches ( 112 centi- metres ) . In our last experiment we found that the illu- mination of a ...
... screen than the other . Measure off the distance . Perhaps the candle is 22 inches ( 55.8 centimetres ) from the the screen , and the lamp is 44 inches ( 112 centi- metres ) . In our last experiment we found that the illu- mination of a ...
Página 37
... screen as the candle , and it is four times as bright , because the square of the distance of the can- dle will divide the square of the distance of the lamp four times . If we measure it another way we find the candle is half the ...
... screen as the candle , and it is four times as bright , because the square of the distance of the can- dle will divide the square of the distance of the lamp four times . If we measure it another way we find the candle is half the ...
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Términos y frases comunes
15.2 centimetres 551 BROADWAY ALEXANDER BAIN ALFRED MARSHALL angle angle of incidence appear beam of light beam of reflection beam of sunlight beautiful black mirror block of wood blue bright candle centi centre CHARLES BARNARD color color-top curious dark room diameter disk distance dotted lines experiment fastened flask focus FRANCIS GALTON give glass gray paper green heliostat hole Illustrations inch 25 millimetres inches 12.7 centimetres lamp lantern light entering light passes look looking-glass M. A. Cloth magic lanterns ments metres mirror mucilage phenomena picture piece plano-convex lens point of incidence postal-card Price Prof Professor rays red square reflected light refraction ring SCIENCE screen shade shadow sheet shine side slide slit smoke spot of light square stars surface things top spin tube University of Erlangen violet wall water-lens window yellow