The Pharmaceutical era . November 4, ] THE PHARMACEUTICAL ERA. G73 A small box with such an aperture in one of its sidesconstitutes the pin bole camera. sold as a cheap sub-stitute for the photographic camera with a Fig. 36.—Image ct ^ioape In h .Aperture Decomposition and Recomposition of White ~If abeam of light be introihu-iMl into a darkened room andcaused to pass tbruugh a triangular glass prism, suit-ably placed, it will \)e spread out into a colored bandknown as the s lar spectrum. If the colored band be passed through a second prismplaced in reversed position,
The Pharmaceutical era . November 4, ] THE PHARMACEUTICAL ERA. G73 A small box with such an aperture in one of its sidesconstitutes the pin bole camera. sold as a cheap sub-stitute for the photographic camera with a Fig. 36.—Image ct ^ioape In h .Aperture Decomposition and Recomposition of White ~If abeam of light be introihu-iMl into a darkened room andcaused to pass tbruugh a triangular glass prism, suit-ably placed, it will \)e spread out into a colored bandknown as the s lar spectrum. If the colored band be passed through a second prismplaced in reversed position, the colored baud willbe recomposed into a beam of white light. From thisdecomposition and recomposition we infer that whitelight is a mixture of all the colors of the spectrum. That this is the case is contirmed by use of a NewtonsDisk, which is simpir a circle of cardboard upon painted the colors of the spectrum. When the diskis caused to rotate rapidly, the separate colors the sensation of white light only is perceived. The Prismatic Colors. —While the several colors of thespectrum merge into each other through an infinite num-ber of shades, it is usual to distinguish several wellmarked hue
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Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
