New model of graph paper (Machine-translation by Google Translate, not legally binding)

摘要

"New model of graph paper", characterized in that it is formed by lines of thick line that are cut in a non-perpendicular direction, forming a succession of equilateral triangles divided in turn into other minor triangles formed by finer lines, allowing the inclination of all these lines a drawing in perspective with great ease. (Machine-translation by Google Translate, not legally binding)