Modern microscopy; a handbook for beginners and students (1912)
Cross, M. I, Cole, Martin J · Chicago, Chicago Medical Book Co. · leaf 147
as a rule, sufficient. Persons having abnormal vision are likely to make errors inmeasuring. To obviate this, a cap carrying a lens that will 126 MODERN MICROSCOPY correct the abnormality should be placed over the top of the eye-piece, as described on p. 84, while measurements are being taken,but… … Fig. 58.—Botterills Trough. Troughs, Live-Cages, Stage Forceps, etc. Troughs,—These are made of various materials, includingglass, vulcanite, brass, etc., and are used in the examination ofinfusoria and animalcule alive under the microscope. Theessentials of a trough are that a medium power, say \…
Microscopy
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