he combinations of an objective (Figs. 22, 23) and adouble convex field lens. The field-lens is in the focus of the eve-lens and there 24 MICROSCOPE AND ACCESSORIES. [CH. I. \ 35. Huygenian Ocular.—A negative ocular designed by Huygens for the tele-scope, but adapted also to the microscope. It is… … Fig. 31. Compensating Oculars of Zeiss, with section removed to show the con-struction. The line A-A is at the level of the upper end of the tube of the micro-scope while B-B represents the lower focal points. It ivill be seen that the mount-ing is so arranged that the lower focal points in all are…
Microscopy
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