Excerpt from A Key to the Modern Sliding-Rule: Containing the Description, and Explanation of the Various Purposes, of That Valuable Instrument, as Now Used by

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced