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 41
e pin (/), and itsapex (a) touching the outer circle. The right handedge a b of the movable triangle will then markoff on the smaller circle the arc of the angleof deviation, while the angle (z), between the 26 PRISMS. margin (a c) of the triangle and the line Io fromthe pin to the centre of the… … Fig. 15.—Mechanical method of shewing how the deviation pro-duced by a prism alters with the angle of incidence. the pin, we can find in a moment the arc of thedeviation produced for any required angle ofincidence ; that is, for any value of i the deviation isrepresented by d. It will be noticed…
Lenses
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