American text books of art education : Geometrical drawing (1873)
Smith, Walter, 1836-1886 · Boston : James R. Osgood & Co. · leaf 90
divide a given line A B into an extreme, and amean proportional. At A erect a perpendicular A 1 equal to half A B ; draw 1 B;with centre 1, and with radius 1 A, describe an arc to cut 1 B in 2;with centre B, and with radius B 2, describe an arc to cut A B in C.A C is the extreme and B C the mean…
Geometrical drawing
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