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The Ddiin Exlicon drawing tool combines a compass, protractor, ruler, golden ratio tool, curved ruler and hexagon and pentagram and the lip stencils all in one device. From accurate ellipses to ...

Object for drawing ellipses consisting of 3 pulleys of aluminum, 1 (instead of 2) screw, cord, 2 graphite leads and manual, in wooden box Size: 30 x 9.6 x 6.4 cm. (11.8 x 3.8 x 2.5 in.) ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This flat wooden blackboard curve has ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...