Elementary chemical microscopy elementarychemi00cham Year: 1921 «>—>—— »>-—>- Fig. 32. Prism Vertical Illuminator. Fig. 3$. Disk Vertical Illuminator. the direction of the reflected ray R. Incident light I is projected upon the prism through the horizontal opening O. A diaphragm D extending not quite halfway across the aperture of the adapter serves to screen the prism and to prevent interfering reflections from blurring the image formed in the microscope. The construction of a disk illuminator is shown in Fig. 33. The incident rays I, I strike a glass or mica disk G and are r

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Elementary chemical microscopy elementarychemi00cham Year: 1921 «>—>—— »>-—>- Fig. 32. Prism Vertical Illuminator. Fig. 3$. Disk Vertical Illuminator. the direction of the reflected ray R. Incident light I is projected upon the prism through the horizontal opening O. A diaphragm D extending not quite halfway across the aperture of the adapter serves to screen the prism and to prevent interfering reflections from blurring the image formed in the microscope. The construction of a disk illuminator is shown in Fig. 33. The incident rays I, I strike a glass or mica disk G and are reflected by it through the objective attached below. The rays I, I enter through a circular opening O. The size of this opening may be changed by turning the collar C which is provided with circular openings of three different diameters. Adjustment of Vertical Illuminators. - - When the object to be examined is small and is supported upon a glass object slide

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