Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 27
Two or more Irreg-ular Curves. Some ofthe many forms ofthese are-shown in cut.They should be eitherof celluloid or rubber. One Drawing Board, not less than 20x26 inches. A fevv Thumb Tacks, a piece of good Rubber, a 6HPencil, either Hardmuths or Fabers; a 6H ArtistsLead for compass points, and a…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
