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 38
Fig. 13.—To shew how a protractor could be used to makeprisms of definite deviations. opened symmetrically with respect to a line join-ing their pivot and the centre of the arc. Or, onthe same principle, a special instrument could bemade, as in Fig. 14. SIMPLEST OPTICAL PROPERTIES. 21 But as prisms… … Fig. 14.—A proposed deviation protractor. The distance of cfrom the centre of the arc 0 is 1-54 times the radius of the latter.The arc is marked in ordinary degrees. Duane has pointed out a disadvantage in thedioptric measurement of prisms in the hands of theoculist, just as the one last spoken of…
Lenses
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