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First edition of "one of the oddest and most beautiful books of the whole century" (McLean). The use of colour is its most iconic feature, with equal angles, lines, or polygonal regions assigned one of the three primary colours. It is rare in both the original cloth (as here) and in the original wrappers. Byrne (1810 1880) was a self-educated Irish mathematician and engineer who "considered that it might be easier to learn geometry if colours were substituted for the letters usually used to designate the angles and lines of geometric figures. Instead of referring to, say, 'angle ABC', Byrne's text substitued a blue or yellow or red section equivalent to similarly coloured sections in the theorem's main diagram" (Friedman). His style remarkably prefigures the modernist experiments of the Bauhaus and De Stijl movements. Exhibited at the Great Exhibition in London 1851, the book was praised for the beauty and artistry of the printing. However, the selling price of 25 shillings was almost five times the typical price for a Euclidean textbook of the time, placing it out of reach of educators who might make use of this new way of teaching geometry. The technical difficulty of keeping the coloured shapes in register greatly increased production costs, and it was therefore never a viable book for cheap mass-production, preventing Byrne's method from becoming widespread or effecting any major change in the teaching of geometry. Even so, its beauty and innovation ensure it remains among the most desirable of illustrated books from the Victorian period. Friedman, Color Printing in England 43; Keynes, Pickering, pp. 37, 65; McLean, Victorian Book Design, p. 70. Susan M. Hawes & Sid Kolpas, "Oliver Byrne: The Matisse of Mathematics", Convergence (Mathematical Association of America), Aug. 2015. Quarto. Geometric diagrams printed in red, yellow, and blue; printed in Caslon old-face type with ornamental initials by C. Whittingham of Chiswick. Original red straight-grain cloth, expertly rebacked preserving the original gilt-blocked spine, covers with ornamental blind panelling, front with gilt tooling, pale yellow endpapers, gilt edges. Bookseller's blindstamp (G. W. Holdich, Hull) to front free endpaper. Extremities gently rubbed, spine darkened, corners and inner hinges professionally restored, foxing and offsetting to contents as usual, the diagrams sharp and bright. A very good copy. Seller Inventory # 151310
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