Artist's Tracing Projector.
Free yourself from tedious copying methods involving graph squares or pantographs. With a comparatively small investment in time and materials, you can build this direct-copy easel-projector that enlarges patterns or sketches up to 5 1/2 times, or reduces them to one-third original size.
Any good camera or enlarger lens of at least 6 inch focal length and an aperture of F-8 or larger can be used.
Five pages ( 3 sheets - front on the first, front and back the other two pages. ) B & W photos, illustrations, expanded view and instructional narrative.
My plans are from original source materials such as books, magazines and other publications and the pages are carefully removed.