Useful for direct layout of parallels at the same distance. (Machine-translation by Google Translate, not legally binding)

摘要

Useful for plotting parallel at the same distance consists of a glegleta with a fixed point (fig.1 and 2, 0) where it rotates and attaches to the technologist, ruler, square, etc. (figures 1 and 2 r) and a reference point (fig.1 and 2, p) (Machine-translation by Google Translate, not legally binding)