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 226
Fig. 118. rays of light from passing to the object-glass: this may beeffected by the employment of one or other of the dark stopsor chambers, represented by fig. 119, which should be broughtinto the axis of the instrument, so as to cut off all the raysthat otherwise would pass to the object-glass,…
Microscopy
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