Drawing a scotia (Quadrants and elliptical)

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Stonemasonry technical skills

atSkillsTech Australia

Method

•Lay out a grid

•Find the centre points of quadrants and their common point (confluence)

•Scribe curves and add fillets at top and bottom of scotia

Scotia construction:(Quadrants and elliptical)

Step 1: Draw a grid of squares and mark out curve centres and confluence

Quadrants

Step 2: Draw the first quadrant to the confluence point

Quadrants

Step 3: Draw the second quadrant, meeting the first quadrant at the confluence point

Quadrants

Step 4: Add fillets at top and bottom

Quadrants

Step 5: Clean up construction lines and draw outlines

Quadrants

Step 6: Draw a horizontal centre line, and a line at 600 to it

Elliptical

Step 7: Step off three times up and down from the centre line

Elliptical

Step 8: Step off three times horizontally from the top and bottom, and mark the first radiating intersection point

Elliptical

Step 9: Step off an equal amount to mark the second radiating point

Elliptical

Step 10: Draw the first set of radiating intersection lines

Elliptical

Step 11: Draw the second set of radiating intersection lines

Elliptical

Step 12: Mark the points of the curve

Elliptical

Step 13: Draw the curve freehand

Elliptical

Step 14: Clean up the construction lines. Add fillets, and draw outlines

Elliptical