The first six books of the elements of Euclid, in which coloured diagrams and symbols are used instead of letters for the greater ease of learners (1847)
Byrne, Oliver, Whittingham, Charles, 1795-1876, Chiswick Press · London : William Pickering · leaf 272
N a given Jlraight line ( ) ^,. to conftruSi a reBilinear figure fimilar to a given one ( and /imiiarly placed. ^ … Relblve the given figure into triangles bydrawing the lines -«—--- and ••..••*•. At the extremities of ———^ make ^ = Jb^^ and % = \J^: again at the extremities of ■ and ^^ = ^^\ : in like manner make ? = ^ ^^ V = V •
Euclid's Elements · Geometry
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