Matter, ether, and motion; the factors and relations of physical science (1892)
Dolbear, A. E. (Amos Emerson), 1837-1910 · Boston, Lee and Shepard · leaf 176
R WAVES 163 edge of the lens that by contracting make the pliablelens less convex and so increase its focal length. Forthe camera there isan exchangeable dia-phragm having per-forations of varioussizes to admit moreor less light throughthe lens. In the eyethere is a coloredmuscular disk calledthe… … Diag. 15. — Photographic Camera. SCLEROTIC COAT_CHOROID COAT<RETINA
Physics
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