The microscope; an introduction to microscopic methods and to histology (1901)
Gage, Simon Henry, 1851-1944 · Ithaca, N.Y. Comstock publishing company · leaf 72
op of distilled water on the cover-glass, andwith the coarse adjustment lower the tube till the objective dips intothe water, then light the field well and turn the fine adjustment oneway and another till the image is clear. Water immersions are exceed-ingly convenient in studying the circulation… … Objeetive Object-bObject-a Fig. 58. Figure to show that in lengthening the tube of the microscope the ob-ject must be brought nearer the principal focus or center of the lens. It will be seenby consulting the figure that in shortening the tube of the microscope the objectmust be removed farther…
Microscopy
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