A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures (1848)
Quekett, John, 1815-1861 · London, H. Bailliere · leaf 245
nc^ as tne value of the squares, ordivisions of the micrometer, is known, the objects over whichthe line are drawn can also be readily ascertained by theapplication of a pair of compasses; and, if necessary, thesquares, as shown in figs. 131 and 132, can be further sub-divided into four, so that… … DETERMINATION OF THE MAGNIFYING POWER. 205 single square, or even the exact distance of any two or more A m Fig. 131 Fig. 132. of the lines of the micrometer, together with a pair of com-passes, will be all that is required. It must, however, beborne in mind, that when the size of an object is…
Microscopy
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-249-25.webp)
