PLATES TO DESCRIPTIVE GEOMETRY. SHADES, SHADOWS AND LINEAR PERSPECTIVE. BY ALBERT Ei. CHItTRCH, PROFESSOR OF MATHEMATICS IN THE UNITED STATES MILITARY ACADEMY. NEW YORK: PUBLISHED BY A. S. BARNES & Co., 111 & 113 WILLIAM STREET. Entered, according to Act of Congress, in the year 1864, by A. S. BARNES & Co., Tn the Clerk's Office of the District Court of the United States for the Southern District of New York /, / / ~~~~i, /,' y- i77. i ~/:: I //:j i i'i:' MI/ I~~I 77 W~~~~~~~~~~~~~~~~~~~~~~~~~ -1 ~~~~~~~~~~~~~~~~~~~~~~~I7................... 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