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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 470

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 470 — lly to the other side of the candle till the opposite halfof the field only is illuminated, and mark again on the paperthe position of the side of the leg. The measure of the angletraversed, shown by the two lines, is that of the pencil oflight. The makers of the object-glasses do not usually… … Fig. 235. piece of mahogany, or other hard wood, of a semicircularfigure, about half-an-inch thick, and of sufficient radius to suitthe length of an ordinary compound body, the curved edge isgraduated into 180°; upon the flat surface of the semicircle,a strip of wood or index, an inch or more in…

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