. The art of projecting. A manual of experimentation in physics, chemistry, and natural history, with the porte lumière and magic lantern. Fig, 71- screen. In this way very humorous distortions of thehuman countenance may be photographed by usingthe camera at c. 94 THE ART OF PROJECTING, TOTAL REFLECTION. This phenomenon is generally shown by properlydirecting a beam of light into a vessel of the simplest way is to fill a glass beaker withwater, containing a little milk or a little magnesiastirred into it for the purpose of enabling the eye totrace the course of the light through
. The art of projecting. A manual of experimentation in physics, chemistry, and natural history, with the porte lumière and magic lantern. Fig, 71- screen. In this way very humorous distortions of thehuman countenance may be photographed by usingthe camera at c. 94 THE ART OF PROJECTING, TOTAL REFLECTION. This phenomenon is generally shown by properlydirecting a beam of light into a vessel of the simplest way is to fill a glass beaker withwater, containing a little milk or a little magnesiastirred into it for the purpose of enabling the eye totrace the course of the light through it. Next placingthe beaker in a convenient place, with a bit of looking-glass direct a small beam of light upwards throughthe side of the vessel, so as to strike the under surfaceof the water. By trial, the proper incident angle willbe found at which the light will not emerge from theupper surface of the liquid, but will be totally reflected ;the course of the beam will be easily traced throughthe milky fluid. With suitable arrangements, very striking and beau-tiful effects may be produced in a stream of Fig* 70, The high tanks made for showing the direction andform of water jets are generally made with a glasswindow opposite the orifice H, through which a beam LIGHT, 95 of light from a lantern or from the sun may be directedwhile the water flows. For the success of this experi-ment it is necessary that the orifice should be round,smooth, and thin, and the body of water in the tankmust not be disturbed by currents. In the figure,water is admitted at F, while at G there is a partitionwith a good many orifices in it through which the waterflows, keeping it at a constant height I. When, there-fore, the light is concentrated upon the orifice H, it isnot scattered, but lights up the whole of the curvedstream, giving it the appearance of molten silver. Ifcolored glasses are interposed back of E, D, the colorof the stream will also correspondingly change, withvery pleasing e
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherbosto, bookyear1877
