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 180
Fig. 67.—To illustrate the cine, arc, and tangent of an angle. other radius is the sine, and a line drawn perpen-dicularly from the extremity of one radius to meetthe other, as R t in the figure, is the tangent of theangle. It will be seen at once that the sine isalways less, and the tatzgent… … Fig. 68.—To illustrate a tangent scale,the arc, and the greater the angle, the greater isthe disproportion between the three quantities.Fig. 68 shews how when angles are projected on to i6o APPENDIX. a straight line, as in the tangent scales representedin Figs. 59 and 60, the graduations increase…
Lenses
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