@article {Cox:2009-09-01T00:00:00:0746-8342:238,
author = "Cox, Barry and Wagon, Stan",
title = "Mechanical Circle-Squaring",
journal = "The College Mathematics Journal",
volume = "40",
number = "4",
year = "2009-09-01T00:00:00",
abstract = "A technique discovered in 1939 can be used to build a device that is driven by standard circular motion (as in a drill press) and drills exact square holes. This device is quite different from the classic design by Watts, which uses a Reuleaux triangle and drills a hole that is almost, but not exactly, square. We describe the device in detail, deriving the equations needed to make a computer simulation. Then we investigate the extension to other polygons and show how the basic idea can be combined with some knowledge of envelopes to produce a device that traces out an exact hexagon.",
pages = "238-247",
url = "http://www.ingentaconnect.com/content/maa/cmj/2009/00000040/00000004/art00001",
doi = "doi:10.4169/193113409X458679"
}