Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 131
Let AC represent the radius. Draw the semicircle ABD.Produce AC to D, and draw BC perpendicular to it. From Aand D draw tangents parallel to BC, and through B drav/ atangent parallel to AD. From B set off ;S£>»e(ifiial to the jadius,and draw the line BF through E« Pj-oduce the tangent throughA… … F D Fig. 232. We are also enabled to find the length of an arc by thismeans ; e.g: the arc to the chord formed by one side of a pentagon, irfH IS-eq3.l.tn j^he circumference, thenarc required. FH -theleno-fh-(;,;\,,e 168. To draw a cycloid. Let AB be the director, and / the generator or point in…
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-32-39.webp)
