Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 132 ELEMENTARY CHEMICAL MICROSCOPY the comparing prism p beneath the slit or out to one side. T attached to a right and left threaded spindle serves to widen or narrow the slit s. Attached to the upper part of K is the re- mainder of the eyepiece with its eye lens e vertically movable by rack and pinion through the milled head F. Fitting above e is Fig. 66. Microspectroscope. (W. & H. Seibert.) a tube A carrying an Amici prism R consisting of three prisms of crown glass (w/> = )

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Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 132 ELEMENTARY CHEMICAL MICROSCOPY the comparing prism p beneath the slit or out to one side. T attached to a right and left threaded spindle serves to widen or narrow the slit s. Attached to the upper part of K is the re- mainder of the eyepiece with its eye lens e vertically movable by rack and pinion through the milled head F. Fitting above e is Fig. 66. Microspectroscope. (W. & H. Seibert.) a tube A carrying an Amici prism R consisting of three prisms of crown glass (w/> = ) alternating with two prisms of flint glass (nD = ). Since the total deviation of a ray of light entering a series of prisms is equivalent to the sum of the deviations which would be imparted to it by each unit in turn, it follows from the alternate

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