Cylindrical slide rules

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Fuller 41'

Stanley Fuller Model 1 calculator/slide rule with mahogany box, stand, and instruction booklet. This calculator is a cylindrical slide rule with a spiral scale 500 inches long (12.6 metres) which gives accuracy to four or five significant figures. The serial number is 6401 over 31 which means it was manufactured in 1931.

D Scale length: 12566 mm. Significant digits: 4.7 to 5.


Copyright 2012, Dave Hoyer.