![]() It will be understood that the presence of the Vertical Illuminator does not encroach upon the field of view. Undergoing total reflection at the oblique face of the prism, the light traverses the objective and is thus concentrated upon the object. The mount of the apparatus has at the side a window, through which the light proceeding from the lamp falls upon a reflecting prism covering half the aperture of the objective. This is accomplished with the aid of a Vertical Illuminator. With higher powers, from Objective B upwards the working distance is too short to admit of direct illumination from without, and in all these cases it becomes necessary to illuminate the object by light passed through the objective. This applies to low power objectives up to HH, say. When the free working distance of the objective is sufficiently long the object can generally be viewed by daylight or lamplight such as can be made to fall on it without any special aids and, when desirable, the lighting can be improved by placing in front of the microscope a Bull’s Eye Condenser (No. it is desirable and often necessary to provide a suitable device for adequately illuminating the object from above. ![]() For the examination of opaque objects, metallurgical specimens, etc. The following description of the Zeiss Vertical Illuminator was extracted from the 1913 catalog: Illumination by Incident Light. ![]()
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