The microscope; an introduction to microscopic methods and to histology (1899)
Gage, Simon Henry, 1851-1944 · Ithaca, N. Y., Comstock publishing company · leaf 237
E APERTURE OF OBJECTIVES.§ 353. Determination of the Aperture of Objectives with an Apertometer.—Ex-cellent directions for using the Abbe apertometer maybe found in the Jour. Roy.Micr. Soc, [878, p. 19, and 18S0, p. 20; in Dippel, Zimmerman and Czapski. Thefollowing directions are but slightly… … Fig. 165. Abbe Apertometer.it consists of a semi-circular plate of glass. Along the straight edge or chord theglass is beveled at 450, and near this straight edge is a small, perforated circle, theperforation being in the center of the circle. To use the apertometer the micro-scope is placed in a…
Microscopy -- Technique
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