Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 25
—Select the points A, B, and C inthe arc, well apart. From A and B as centres, and then from B and 0 ascentres, describe arcs of equal radii cutting each other; draw the two lines D Eand F G through their intersections. The point 0, where these lines meet, isthe centre required. To descrihe a…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![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-119-326.webp)
