Text-book of medical and pharmaceutical chemistry . one of cobalt are cautiously mixed, the color of the onemixes with that of the other so as to form a colorless solution,because the colors are complementary. 36. The Spectrum.—When a beam of white light is passed4 34 MEDICAL CHEMISTRY. through a prism, as represented in Fig. 11, it is not only refracted—that is, bent from its original course, but the colors of which itis composed being unequally bent, are separated from oneanother. If now we allow them to fall upon a white screen, S,Fig. II, they produce a series of blending tints upon it, wh
Text-book of medical and pharmaceutical chemistry . one of cobalt are cautiously mixed, the color of the onemixes with that of the other so as to form a colorless solution,because the colors are complementary. 36. The Spectrum.—When a beam of white light is passed4 34 MEDICAL CHEMISTRY. through a prism, as represented in Fig. 11, it is not only refracted—that is, bent from its original course, but the colors of which itis composed being unequally bent, are separated from oneanother. If now we allow them to fall upon a white screen, S,Fig. II, they produce a series of blending tints upon it, whichare called a spectrum. The red rays, which are least bent from their course, are saidto be the least refrangible, while the violet are the mostrefrangible. Intermediate between these colors we find theorange, yellow, green, blue, and indigo. The prism thus gives usan easy means of analyzing a beam of light, to show the characterof the rays producing it. Such observations are usually conductedby means of an instrument called a 37- The Spectroscope.—Fig. 12 will illustrate the con-struction of the spectroscope. The light is received from thesource of light (F), through a very narrow slit, regulated by ascrew; it passes through the tube (A), called the collimator, andis directed upon the prism (P) which may be made of flint glass,or it may be made hollow and filled with bisulphide of carbon. Insome instruments there are several flint glass prisms so arrangedthat the light is made to pass through all of them, so as to securea wider dispersion of the rays than can be obtained with one beam of light, after traversing the prisms, is viewed with thetelescope (B). For purposes of comparison, an additional tube(C) is attached, by which another light may be thrown upon thesurface of the prism so as to be reflected through the telescope LIGHT. 35 by the side of the light from F.* Many instruments now madeare so arranged that the ray of light in passing thr
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