Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 279
y cen-tred, are of great value inpractical work, as well as fromthe fact that they are so placedas not to interfere with thestage, makes this arrangementof diaphragms and stops an excellent one, and it is not clear why ithas fallen into disuse. It had been the custom to recommend the use of this… … Fig. 197.—Gilletts condenser, from Hogjon the Microscope. WHAT IS ESSENTIAL IN A CONDENSER 25I power work it soon became manifest to practical workers that it isonly when, as Sir David Brewster pointed out, the source of light isfocussed by the condenser on the object that a really critical image…
Microscopy
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