Elementary chemical microscopy elementarychemi00cham Year: 1921 Tungsten Filament Fig, 12. Lamp used in the Silver- man Illuminator. Fig. ii. Clamp for holding Silverman Illuminator below objectives when used with Greenough type Binocular Microscopes. from the side, but with higher powers or with the illuminator well lowered the illumination becomes more and more oblique. The student must always remember that a change from one magnification to another in order to better resolve an object is also accompanied by a corresponding change in the character of the illumination which of necessity m
Elementary chemical microscopy elementarychemi00cham Year: 1921 Tungsten Filament Fig, 12. Lamp used in the Silver- man Illuminator. Fig. ii. Clamp for holding Silverman Illuminator below objectives when used with Greenough type Binocular Microscopes. from the side, but with higher powers or with the illuminator well lowered the illumination becomes more and more oblique. The student must always remember that a change from one magnification to another in order to better resolve an object is also accompanied by a corresponding change in the character of the illumination which of necessity must produce a change in the appearance of the structural details being studied. This type of illuminator is in no manner a substitute for a vertical illuminator but has a field of usefulness distinctly its own. The lamps are made in colorless (clear) glass or blue ':c daylite ' glass, the latter approximating north sky illumination. Illumination by Combined Reflected and Transmitted Light. - This system is commonly resorted to in the photomicrography of opaque objects in order that in the finished photograph they may be made to stand out more prominently and that their
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