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Pocket-book of mechanics and engineering (1864)
Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 327
319 Double Concave Lens.Br f=- (m—l)(R+r) … 320 Flano Concave Lens,r /=- m—1 The optical centre is in the concavesurface.Mechanical engineering · Engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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