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Music is the pleasure the human soul experiences from counting without being aware that it is counting.
In N. Rose, Mathematical Maxims and Minims, Raleigh NC: Rome Press Inc., 1988.
Loci: Convergence
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Van Schooten's Ruler Constructions
Solution to Problem V
Problem V: Given an indefinitely long straight line AB and a point C on it, to draw a line CF which is perpendicular to the given straight line.
Construction: Draw, as in the previous problem, any perpendicular DE above AB, and then, from C, by the third, problem, draw a line CF parallel to that. It will be the one sought.
Branch point: