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 262
underneath the brass plate, the apertures will becoloured red and green, fig. 138, abc, and if the eye-piece berevolved, at every quarter of the circle the colours will beseen to change alternately from red to green, and from greento red, fig. 139, a V c a11. If the brass be again slid along so…
Microscopy
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