The microscope; an introduction to microscopic methods and to histology (1899)
Gage, Simon Henry, 1851-1944 · Ithaca, N. Y., Comstock publishing company · leaf 28
incipal optic axis of the microscopeand of the eye. Cr. Cornea of the eye. L. Crystal-line lens of the eye. R. Ideal refracting surface atwhich all the refractions of the eye may be assumedto take place. Hold the simple microscope directly toward the sun and move itaway from and toward a piece of… … Fig. 17.Tripod Magnij point represents approximately the principal focus ( Pigs. 10, n). With-out changing the position of the paper or the magnifier, look into themagnifies and note that the letters arc very in-distinct or invisible. Move the magnifier a cen-timeter or two farther from the paper…
Microscopy -- Technique
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