Modern microscopy; a handbook for beginners and students (1912)
Cross, M. I, Cole, Martin J · Chicago, Chicago Medical Book Co. · leaf 86
Fig. 23.—Abbes Apehtometek. outer edge of the apertometer, until they are set exactly on theextreme margins of the back lens. The reading is then taken bythe divisions on the face of the apertometer against which thepointers have now arrived. In the case of an oil or water im-mersion lens, the…
Microscopy
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Artificial and natural flight [microform] (1908)](https://img.insideoutlibrary.com/img/200/ia-artificialnatura00maxirich-51-16.webp)
