The microscope : its construction and management : including technique, photo-micrography, and the past and future of the microscope (1893)
Heurck, Henri van, 1838-1909 · London : C. Lockwood ; New York : D. Van Nostrand Co. · leaf 120
THE FINDERS. 99 On the stage are traced a series of horizontal and vertical lines, one millimetre apart, the two last of which form the o of the scale, and cross one another exactly in the centre of the stage opening. Thelines are numbered from o up to 40 (fig. 90;?). … In order to find again an object which has been seen in the field,the number merely of the two lines (one horizontal and the othervertical), which coincide respectively with the left hand and upper edgesof the slide have to be noted; whenever the slide is placed on theseco-ordinate lines the object…
Microscopy
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