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A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures (1848)

Quekett, John, 1815-1861 · London, H. Bailliere · leaf 140

An illustration from A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures, 1848, leaf 140 — . The former method isadopted by Mr. Ross and Mr. Smith, and the latter by Mr.Powell; every part of this instrument through which thelight passes should be made black, so that no other rays thanthose from the mirror should interfere with the illumination. The use of the diaphragm is to modify the… … 100 PRACTICAL TREATISE OX THE MICROSCOPE. will often suffer greatly from fatigue, and when taken awayfrom the instrument, a dark spot will be seen upon any objectthat is white; to remedy this inconvenience, that part of thediaphragm-plate where no hole is may be supplied with apiece of grey or…

Microscopy

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