but a combina-tion of these two or three lines, can be quite as readi-ly drawn. Symmetry is, indeed, the key whichunlocks many of the secrets of design and drawing. See that your pupils, when they examine the draw-ings on their slates, do not look at them obliquely;for, if they look at them thus,… … Symmetrical Arrangement about the Centre of an Equi-lateral Triangle. Instead of a square for thegeometrical basis, take, thistime, an equilateral triangle.Having drawn the triangle,bisect each side; from eachpoint of bisection, draw astraight line to the oppositeangle. The lines will crosseach…
Drawing -- Study and teaching
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![An illustration from Cosmographia in qvatvor libros distribvta summo ordine, miraqve facilitate, ac breuitate ad magnam Ptolemæi mathematicam constructionem, ad vniuersamque astrologiam institutens. Francisco Barocio ... avtore. Cum præfatione eiusdem autoris, in qua perfecta quidem astrologiæ diuisio, & enarratio autorum illustrium, & voluminum ab eis conscriptorum in singulis astrologiæ partibus habetur: Joannis de Sacrobosco verò 84 errores, et alij permulti suorum expositorum, & sectatorum ostenduntur. rationibusq[uam] redarguuntur. Præcesserunt etiam quædam communia mathematica, necnon arithmetica, & geometrica principia, nonnullæq[uam] propositiones, de quibus in toto opere sæpe fit mentio: ac demum locupletissimus index eorum, quæ ipsa Cosmographia continentur .. (1585)](https://img.insideoutlibrary.com/img/200/ia-cosmographiainqv00baro-154-60.webp)
