Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 90
e.o-. if AB = 9 feet and CD-4 feet, then AK: H A Fie. 6 feet. 116. To divide a line in medial section, i.e. into EXTREME andMEAN proportion. Let AB be the line. At Adraw AC perpendicular toAB, and equal to it. BisectAC in D. With D as centre,and DB as radius, draw thearc cutting CA produced inE.… … At A draw the line AD ofindefinite length, and at anyangle to AB. From A, alongAD, mark off seven equaldistances of any convenientlength. Join 7B. At 3 drawthe line 3C parallel to 7B(Prob. 3). Then AC : CB : : 3 : 4,or, AB : AC : : 7 : 3. 118. To divide a line proportionally to a given divided…
Geometrical drawing · Design · Drawing
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
