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Henry Augustus Swenson
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Length-Measuring Instruments Using Mechanical Means
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Drawing Aids And Blackboards
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Abstract
5456. Swenson, H. A. March 5. Curve-drawing instruments.- Templets A for drawing circular arcs are fitted at one end with a pivoted circular sector E, to assist in the drawing of tangents. The two curves of the templet A have equal radii, and are graduated in opposite directions.
GB190405456D1904-03-051904-03-05Improvements in Instruments for Drawing Curves
ExpiredGB190405456A
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