Modern microscopy; a handbook for beginners and students (1912)
Cross, M. I, Cole, Martin J · Chicago, Chicago Medical Book Co. · leaf 87
ives with unusually large lenses, and also inapplying it to condensers. The reason for this is that theauxiliary objective supplied with the apertometer, which is tobe screwed to the end of the draw-tube in order to produce amicroscope for clearly observing the aperture of the objectiveunder test,… … Fig. 24.—CheshiresApertometer, byR. and J. Beck. such conditions is too small. It is necessary in such cases to doaway with the auxiliary objective altogether, and to observe theback of the objective under test by looking directly at it downthe microscope-tube without the intervention of any lenses…
Microscopy
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