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 45
two simplemethods some years ago, one most suitable forpractice, the other for demonstration purposes. Thefirst can be made without expense, and employedwithout artificial light. It consists simply of astrip of paper or cardboard suspended horizontallyon the wall, at such a height from the floor as… … Fig. 16.—First mode of prismetry. hold it at this distancef with its apex to the left,and so that its upper border appears just beneaththe line of degrees, as in the figure. The verticalborder of the card appears necessarily displaced * For tangents of degrees, see p. 161. A scale of this kindhas…
Lenses
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