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 186
DR. E. HARTNACK. i6S The price of this stand, furnished with all these improvements,;£i2 ; in a simple form it only costs jQq 16s. … Dr. E. Hartnacks objectives preserve their old reputation, and arecounted amongst the best there are. No. 2 is intended for feeble magnification; its power varies from 25to 40 diameters. No. 4 is an excellent objective. It is very clear, and its powers of 166 DR. E. HARTNACK. definition and…
Microscopy
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