Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 125
C and bisect it in D. Join BD. From A and C drawthe lines AE and CF parallel to BD. Through B draw the lineEF parallel to AC. E B Produce BD to H,and make D H equaltoBD. Divide ADand DC and alsoAE and CF into anumber of equalparts, say four. Jointhe divisions on AEandCFtoB. FromH, through the… … 112 GEOMETRICAL DRAWING AND DESIGN. 161. To determine points for drawing a parabola, the focus Aand the directrix BC being given. Draw the line EAD perpendicular to the directrix BC (Prob. y),which will give the axis. Bisect AD in F (Prob. i), which willbe the vertex of the curve. Take any points…
Geometrical drawing · Design · Drawing
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
