Mechanical drawing : a manual for teachers and students (1902)
Cross, Anson Kent · Boston : Ginn & Co. · leaf 26
cle C. Draw the diameter i—2^nd a radius j-^ per-pendicular to it. Bisect 2-3 in 5, and with 5 ascentre and radius ^-4, intersect 2-1 in 6. With4 as centre and radius 4-6 intersect the circle in7. Set off the distance 4-/ from y to 8, 8 to g,g to 10. Join 4-/, /-8, 8-g, g-io, and 10-4. Problem…
Mechanical drawing
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-100-223.webp)