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 115
-——■-, FIGURE II. If ^=^.hen = ,if„o. take ——^— r= ^—— draw ■■■, then ^c—I :>»^ in ^^ I and I ,^^ , —— common. (B. i.pr. 4.) a part equal to the whole, which is abfurd:■—— IS * and no other line is equal to ■^ drawn from the fame point to the circumfer- ence ; for if it were nearer to the one… … I. ^Voll ^^ f° P°^ without a circle, Jlraight iiKCs \ ——— \ ore (jrdwn to V»y the cir- cu/nference; of thofe falling upon the concave circum-ference the greatejl is that ( —») ichich fafjathrough the centre, and the line ( i ) ichich isnearer the greatejl is greater than that ( )ichich is more…
Euclid's Elements · Geometry
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-317-209.webp)