t described, familiarize the pupils with the exactform of the ellipse. It is essential that they shouldbecome perfectly familiar with this curve, as it is sofrequently employed byboth artists and artisans. To draw a cone, with anoblique Aiew of its base,first draw an ellipse, andthen add a vertical… … 74 TEACHERS MANUAL. cones, giving a more or less oblique view of the base.Illustrate with a model. There are many variations in the form of the ellipse,since its form depends on the difference between itslength and its breadth. It may be so broad as closelyto aj^proach a circle, or so narrow as to…
Drawing -- Study and teaching
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-55-84.webp)
