Perfected squad and cartabon game. (Machine-translation by Google Translate, not legally binding)

摘要

Improved square and square set characterized essentially because the opening of the square is contoured in right isosceles triangle while the opening of the square has a right triangle configuration with acute angles of 30º and 60º being the long leg of the equal square. Length than the hypotenuse of the bevel which makes it possible to draw lines with different inclinations without hardly changing the position of the instruments, facilitating the work and making it noticeably faster. (Machine-translation by Google Translate, not legally binding)