Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 816
PL.XYII. … APPENDIX. PATENT-OFFICE DRAWINGS must be made upon pure white jDaper, of a thickness corresponding to three-sheet Bristolboard, with surface calendered and smooth. India ink alone must be used. The size of the sheet must be exactly 10 by 15 inches. 1 from its edges single mar-ginal lines are to be…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
