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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 482

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 482 — Fig. 236. coarsest, the other six with so low a power not being visible,and even those in the fourth band requiring some care in the il-lumination to define themsatisfactorily. In orderto use this test, the bandsare viewed by glasses ofdifferent focal lengths, inthe same manner as any237 other… … 442 MANIPULATION. form a good criterion of the merits of any magnifying powerfrom 100 to 2,000 diameters. Thus, for instance, if a quarterof an inch object-glass be employed with the best illumina-tion, nine of the bands may be seen, and the lines in seven ofthem clearly defined, but still no trace…

Microscopy

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