The downloadable charts are a matrix of dietzgen slide rules catalogs and price lists that was compliled by bruce babcock phd and was published in the journal of the oughtred society jos october 1996 volume 5 number 2 this comprehensive research will enable you to find the period of manufacture for most every dietzgen slide rule from 1887 through 1972.
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The slide rule or slipstick is a mechanical analog computerthe slide rule is used mainly for multiplication and division and also for scientific functions such as roots logarithms and trigonometry but usually not for addition or subtraction there are many different styles of slide rules they are usually linear or circular they have a standardised set of markings called scales.
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