Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 69
a given square ABDC, to inscribe four semicircles havingadjacent diameters. The Quatrefoil.—Draw thediagonals AD and CB.Bisect each side of the squarein the points E, F, G, andH, and join EF and GH.Bisect HD in K and FB inL, and join KL, cutting GHin N. With P as centre, andPN as radius, mark off… … 56 GEOMETRICAL DRAWING AND DESIGN. 83. Within a given circle to inscribe any number of equal semi-circles having adjacent diameters. For example, seven. The Heptafoil.—Find centre C (Prob. 32). Divide the circle into as many equal partsas the number of semi-circles required (in thiscase seven), and…
Geometrical drawing · Design · Drawing
Internet Archive · Wellesley College Library · 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-104-252.webp)
