Search Loci: Convergence:
The purpose of models is not to fit the data but to sharpen the questions.
11th R. A. Fisher Memorial Lecture, Royal Society, 20 April 1983
Van Schooten's Ruler Constructions
Problem II: Given a straight line with endpoints A, B, to bisect it.
Construction: Take any point C at random away from the line AB, and from A through C draw the indefinitely long line ACD, and locate on that line CD equal to the double of AC, and from D through B make a straight line. In that line, put BE equal to BD, and, joining C, D, I say it bisects AB at F.
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