Logarithmetica Brittanica - 1952

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Special calculating machine created by Thompson to assist in the production of these tables.
It was formed of four hand calculators geared together.
The tables were produced using "difference methods" (c.f. Babbage's "difference engine").

Image 1952-Logarithmetica-DSCN1550.jpg

Photo from Logarithmetica Brittanica

Photo page created Fri Dec 2 18:07:15 2005. All information © Eric Foxley.