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Quarterly Journal of Microscopical Science, Vol s3-100, 321-324, Copyright © 1959 by Company of Biologists

The Use of the Philips ‘Mirror-condenser Lamp’ in Microscopy

JOHN R. BAKER 1 and WILFRID LLOWARCH 2

1 Cytological Laboratory, Department of Zoology, University Museum, Oxford
2 University of London Institute of Education, Malet St., London, W.C. 1

The primary source of light is a coiled filament. Ellipsoidal and spherical mirrors collect nearly all the light it produces and project it on to an area of about 41/2 x 3 1/2 mm outside the bulb. One end of a solid glass rod is placed in or near this area. The light travels along the rod by internal reflexions. A bull's-eye lens, placed beyond the other end of the glass rod, focuses the emerging light on the lower focal plane of the substage condenser of the microscope. Very intense illumination is produced. It is moderated by a variable resistor.

The lamp is suitable for use with objectives of focal lengths from 16 mm downwards. It is particularly adapted to high-power microscopy of all sorts. It is easy to use.






© The Company of Biologists Ltd 1959