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Ophthalmic lenses and accessories; lenses, frames, magnifiers and readers .. (1916)
Bausch & Lomb Optical Company · Rochester, N.Y. : Bausch & Lomb Optical Co. · leaf 29
Fig. 15 Action of Piano-Cylindrical Lens onParallel Ravs … Fig. 16 Action of a Sphero-Cyliudrical Lens on Parallel Rays B A U S C H LOMELenses · Eyeglasses
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
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