Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 95
Divide the long axis into three equal parts,draw the two circles and where they intersectone another are the centres for the tangentarcs of the ellipse as shown by the figure. 40. To draw am ellipse by circle arcs. Given the two axes, set off the short axisfrom A to b, divide b B into three equal…
Mechanical engineering · Engineering
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-101-226.webp)
