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Description and use of "The Sectograph", principally intended for the purpose of dividing right lines into equal parts, measuring, laying down, or dividing angles, and inscribing polygons in the circle, & c.
Description and use of "The Sectograph", principally intended for the purpose of dividing right lines into equal parts, measuring, laying down, or dividing angles, and inscribing polygons in the circle, & c.London : Printed by Richard and Arthur Taylor, 1814.