Perspective and geometrical drawing : adapted to the use of candidates for second and third-class teachers' certificates (1887)
McGuirl, Thos. H. (Thomas H.) · Toronto, Ont. : W. Briggs · leaf 130
Fig. 98. GEOMETRICAL DRAWING. 127 Let B, C be the foci and A, given point on the curve; joinBA and CA and produce them to D and F; bisect the angleBAD by AK, and the angle DAF by AG. Then will KA bea tangent and GA a perpendicular or normal to it, at thepoint of contact^ A. (Fig. 98.) (6) From an… … Fig. 99. Let A be an external point; draw major axis BC, and onit describe the semi-circle BFC; draw a tangent AF to thecircle at F; draw FE perpendicular to BC, cutting curve inG; join AG, which will be a tangent, to the curve. (Fig. 99.) No. 26.—To draw an oval of a given width. Let AB be the…
Geometrical drawing · Perspective
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