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 233
vided glass placed in the focusof the eye-lens: if the positive eye-piece is used, the dividedglass is placed below the field-lens; but if the negative, thenthe point selected is between the two lenses. The positiveeye-piece is the invention of Ramsden, and has been before alluded to in pages 73… … MICROMETER. 193 it consists of two tubes, sliding one within the other; theexternal one has the divided glass screwed into its lower end,and the internal carries the two lenses, as shown in fig. 123.When this figure is compared with fig. 91, it will be seenthat the field-lens is reversed; that is,…
Microscopy
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