On the Origin of Clockwork, by Derek J. de Solla Price 30001 [Full title: On the Origin of Clockwork, Perpetual Motion Devices, and the Compass] [Link: http://www.gutenberg.org/3/0/0/0/30001 ] [Files: 30001.txt; 30001-8.txt; 30001-0.txt; 30001-h.htm] Thanks to Chris Curnow, Turgut Dincer, Joseph Cooper and the Online Distributed Proofreading Team at http://www.pgdp.net. Regards, Al