The clinical use of prisms; and the decentering of lenses (1893)
Maddox, Ernest Edmund, 1860-1933 · Bristol : J. Wright ; London : Simpkin, Marshall, Hamilton, Kent · leaf 177
temporary pair for a few evenings first, to learnhow they suit, but I now think this rarely needful,for if the conditions of convergence be carefullystudied we need hardly ever prescribe prisms withoutfeeling pretty sure beforehand of their effects, eventhough, as is often equally the case with… … Fig. 66.—Rectangular prisms in a frame as suggested in the text.This frame may be obtained from Messrs. Curry & Paxton. rectangular* prisms, the shape of which permitsthem to be adjusted at once, and removes anypossibility of their displacement. Each prism hasa longitudinal groove in its upper…
Lenses
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