sent the end of a C3din-der or pencil. This circle iscalled the eye of the spiral.Let the spiral begin on thehorizontal line iit b, cross theI. vertical line above at 1. the horizontal line (left) at 1, the vertical line below at3, the horizontal line (rii;ht) at 4. The figures 1, 2,3, 4, indicate… … PRACTICAL DESIGN. 127 the part of the revolution accomplished. The dis-tance from ^ to 4 is, therefore, equal to the circum-ference of the circle, or would be in an actualillustration with a cylinder and cord. Before beginning to draw the spiral itself, mark ontlie horizontal and vertical lines the…
Drawing -- Study and teaching
Internet Archive · New York Public Library · Public Domain Mark 1.0. Free to use for anything.
