This section is from the book "Modern Shop Practice", by Howard Monroe Raymond. Also available from Amazon: Modern Shop Practice.

With O as a center and a radius of about 1 inch draw the given circle. Assume P some point outside of the circle about 2 1/2 inches from the center. Draw a straight line passing through P and O. Bisect P O and with the middle point F as a center describe the circle passing through P and 0. Draw a line from P through the intersection of the two circumferences C. The line P C is tangent to the given circle. S nilarly P E is tangent to the circle.

The angle P C O is inscribed in a semicircle and hence is a right angle. Since P C 0 is a right angle, P C is perpendicular to C 0. The perpendicular to a radius at its extremity is tangent to the circumference.

In inking Plate VI, the same method should be followed as in previous plates.

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