Elementary chemical microscopy elementarychemi00cham Year: 1921 '.'..^â ,i'.t,,', ,','.'.^,v ', .â lvyl'.','.',r' v ' ' ^ 11 ' ' i 'A \ jn^l. Fig. 34. Nachet Vertical Illuminator. tion of the point of incidence upon R of the illuminating rays from the radiant, according to the power and mounting of the objective employed. The light rays proceeding from the radiant pass through the lens L, and striking the surface R, pass through the objective which now acts as a condenser, throwing a tiny spot of intense light upon the surface of a metal preparation M. The light rays reflected from M reen
Elementary chemical microscopy elementarychemi00cham Year: 1921 '.'..^â ,i'.t,,', ,','.'.^,v ', .â lvyl'.','.',r' v ' ' ^ 11 ' ' i 'A \ jn^l. Fig. 34. Nachet Vertical Illuminator. tion of the point of incidence upon R of the illuminating rays from the radiant, according to the power and mounting of the objective employed. The light rays proceeding from the radiant pass through the lens L, and striking the surface R, pass through the objective which now acts as a condenser, throwing a tiny spot of intense light upon the surface of a metal preparation M. The light rays reflected from M reenter the objective to form the image seen in the microscope. A noteworthy feature of this type of vertical illuminator is the placing of the prism P in such a position as to bring its lower surface as close to the upper lens combination of the objective as it is possible to do. This greatly reduces the danger of the formation of a hazy or cloudy image by elimi- nating internal reflections. The position of the prism P is fixed, hence all adjustments of the light rays must be made by dis- placing the iris diaphragm and thus changing the position of the spot of light upon the reflecting surface R. The Leitz Vertical Illuminator ! is so constructed as to permit the insertion of either a disk or a right-angled reflecting prism above the objective, and is therefore applicable to all heights and powers of objectives. The construction is shown in Fig. 35. To a cylindrical adapter K a collimator tube T is attached which carries a condensing 1 E. Leitz, Wetzlar, Germany.
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