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

Describe a circle, 2" radius.
Note. - A preliminary lesson may be given on the use of the compasses. Teach the characteristics of a circle and terms used in connection with the same, as centre, radius, diameter, circumference.
This model may be used as a mount for a calendar.
 
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