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Pocket-book of mechanics and engineering (1864)
Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 328
then o is the optical centre. Optic?. 297 … 322 Single Microscope,I-.O-f-.f-i, /--«£-, D-j^ *-•■¥>Mechanical engineering · Engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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