An Inexpensive Microscope Lamp for Critical Illumination

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Abstract
A microscope lamp with light of adjustable intensity, which will afford critical illumination of a quality satisfactory for the most exacting cytological work, can be constructed for about $7.50. The essential parts needed are: auto headlight bulb, radio power transformer, radio “potentiometer”, and simple plano-convex lens. A ground glass is not used with 4 and 2 mm. objectives, a solid source of light being obtained by placing the bulb so that one filament coil is directly behind the other. This light source is brought to a focus by the condensing lens at a field diaphragm and this image is projected by the microscope condenser into the plane of focus of the microscope.

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