. The Pharmaceutical era. Fig. 55. Image Formed ThroughApertnie. November 4, ISil.] THE PHARMACEUTICAL ERA. 673 A small box with such an aperture in one of its sidesconstitutes the pin hole camera, sold as a cheap sub-stitute for tlip photisnipliio with a Fig. 06.—Image of Landscape Formed TbrouyU Aperture. Decomposition and Recomposition of While Light.— If nbeam of light be iiitroilnoed into a darkened room andcaused to pass through a triangular glass prism, suit-ably placed, it will be spread out into a colored bandknown as the s lar spectrum. If the colored band be passed th
. The Pharmaceutical era. Fig. 55. Image Formed ThroughApertnie. November 4, ISil.] THE PHARMACEUTICAL ERA. 673 A small box with such an aperture in one of its sidesconstitutes the pin hole camera, sold as a cheap sub-stitute for tlip photisnipliio with a Fig. 06.—Image of Landscape Formed TbrouyU Aperture. Decomposition and Recomposition of While Light.— If nbeam of light be iiitroilnoed into a darkened room andcaused to pass through a triangular glass prism, suit-ably placed, it will be 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 l>eam 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 confirmed by use of a NewtonsDisk, which is simply a circle of cardboard upon whichare painted the colors of the spectrum. When the diskis caused to rotate rapidly, the separate colors disappear,and the .sensation of white light only is perceived. The Prismatic Colors.—AVhile the several colors of thespectrum merge into each other through an infinite num-ber of shades, it is usual to distinguish several we
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Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
