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 212
es perfect steadiness in everyportion of the instrument. Cork plates inserted underneath the feet addto the stability of the instrument, while at the same time they protectthe table from being rubbed by the brass. When the instrument is inclined in a horizontal position the optic axisis 25… … Fig. 140. 192 POWELL AND LEALAND. anterior focus of the ocular is about 10 inches ; as we have already said,it is very important that the optical length of the tube should not vary;its variation, when the image is not altered, does not exceed \ inchwith objectives of i inch and upwards. The 2 inch…
Microscopy
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