![A Key to the Modern Sliding-Rule: Containing the Description and Exlpanation [!] of the Various Purposes, of That Valuable Instrument, as Now Used by His Majesty's Officers of Customs, Excise, &C. and Also of Two Improved Sliding-Rules, for Speedily and a](https://www1.alibris-static.com/a-key-to-the-modern-sliding-rule-containing-the-description-and-exlpanation-of-the-various-purposes-of-that-valuable-instrument-as-now-used-by-his-majestys-officers-of-customs-excise-c-and-also-of-two-improved-sliding-rules-for-speedily-and-a/isbn/9781141478255.gif)
A Key to the Modern Sliding-Rule: Containing the Description and Exlpanation [!] of the Various Purposes, of That Valuable Instrument, as Now Used by His Majesty's Officers of Customs, Excise, &C. and Also of Two Improved Sliding-Rules, for Speedily and a
