I. On an aplanatic searcher, and its effects in improving high-power definition in the microscope
1870 ◽
Vol 18
(114-122)
◽
pp. 327-330
The Aplanatic Searcher is intended to improve the penetration, amplify magnifying-power, intensify definition, and raise the objective somewhat further from its dangerous proximity to the delicate covering-glass indispensable to the observation of objects under very high powers. The inquiry into the practicability of improving the performance of microscopic object-glasses of the very finest known quality was suggesed by an accidental resolution in 1862 of the Podura markings into black beads. This led to a search for the cause of defective definition, it any existed. A variety of first-class objectives, from the 1/16 to the 1/4, failed to show the beading, although most carefully constructed by Messrs. Powell and Lealand.
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1958 ◽
Vol 105
(10S)
◽
pp. 550-558
◽
2021 ◽
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