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 80
Fig 50. (■) A Treatise on Achromatic Microscopes, by Richard Beck, London, 18 THE OBJECTIVES. 59 … 60 THE OBJECTIVES. In fig. i is seen the appearance ot the markings where thefocussing of the object is perfect, and when the correction adjustmentof the objective leaves nothing to be desired. In fig. 2 the correction of the objective is equally perfect, but theobject is found to be either a…
Microscopy
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