This section is from the book "Manual Training - Cardboard Construction", by J. H. Trybom. Also available from Amazon: Cardboard Construction.

1. Describe a circle,
2" radius.
2. Draw the horizontal and vertical diameters.
3. Bisect quadrants, using the compasses, and draw the diameters.
4. With extremities of diameters as centres describe the arcs forming the outline of the model.
Note. - Teach how to bisect a line.
 
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