45.159Figure 3-9.-Drawing a circle in ink.circles. (See fig. 3-9, view A.) If the pen is notperpendicular to the paper, ink will not flowproperly. To draw large circles, insert theextension bar in the pen or pencil leg, as shownin figure 3-9, view B. When the extension bar isused to draw large circles, the process of usingthe compass with only one hand becomesawkward. You should use both hands, as shownin figure 3-9, view B.Use of the French CurveThe french curve is used to draw a smooth linethrough predetermined points. After the pointsare plotted, a light pencil line should be sketchedto connect the points in a smooth flowing line.To draw the finished line over the freehand line,match the various parts of the french curve tovarious segments of the freehand curve. Avoidabrupt changes in curvature by placing the shortradius of the french curve toward the short radiusportion of the line to be drawn. Change yourposition around the drawing board whennecessary so that you can work on the side of thefrench curve that is away from you. You shouldavoid working on the “under” side of the frenchcurve. Place the french curve so that it intersectsat least two points of the line. When drawing theline along the edge of the french curve, stop shortof the last point intersected. Then move the frenchcurve along to intersect two or three more pointsand make sure that the edge of the curve connectssmoothly with the line already drawn. Whenusing the irregular curve, you can draw a perfectlysmooth curved line by plotting enough points (theFigure 3-10.-Use of the french curve.3-8
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