similar tothe first. Card-Exercise IX. ABSTRACT CURVES, I.ALAXCED SPIRAL FORM. Draw the central line 1 2, and divide it into four equal parts. Through thelower point of division, drawthe horizontal line 3 4, makingit equal to one-half of 1 2. Alittle below the centre of theupper fourth of the… … PRACTICAL DESIGN. 120 When drawing the spiral, frequently turn it upsidedown for examination. Unless guarded against it,the eye easily becomes accustomed to an error ina curve of this character, and at last cannot evendetect it. By viewing the curve in all positions, theliability to error is…
Drawing -- Study and teaching
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