Graham's Square Root Extractor
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The Demonstration shows Graham's square root extraction, based on the equivalence between and . Thus if the ruler is marked with units that are 10 times as large as those on the ruler, the green point will fall on the ruler at .
Contributed by: Izidor Hafner (August 2012)
Open content licensed under CC BY-NC-SA
 L. A. Graham, Ingenious Mathematical Problems and Methods, New York: Dover Publications, 1959, pp. 74–75.
"Graham's Square Root Extractor"
Wolfram Demonstrations Project
Published: August 14 2012