A text book of geometrical drawing, for the use of mechanics and schools, in which the definitions and rules of geometry are familiarly explained (1849)
m^ and a guage set from H to R which run on all thecorners^ gives the lines for reducing the square to an octagon;the corners are again taken ofF^ and finally finished with a toolappropriate to the purpose. The centre of each face of the octa-gon gives a line in the circumference of the circle^…
![An illustration from Il terzo [-qvinto] libro ... (1551)](https://img.insideoutlibrary.com/img/200/ia-ilterzoqvintolib00serl-9-13.webp)
