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Covers the history of modern day adding devices from 1885 with the "Marconi Box" with rubber bands and wires to electrical motor driven machines of the 1940's. Discusses styles of computing throughout this period.

URLs from www.xnumber.com:

URL: http://www.xnumber.com/xnumber/sinclair_notes.htm URL: http://www.xnumber.com/xnumber/mechanical1.htm URL: http://www.xnumber.com/xnumber/japanese_calculators.htm URL: http://www.xnumber.com

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