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Oughtredus Explicatus, Sive, Commentarius in Ejus Clavem Mathematicam, by Gilbert Clerke, is a detailed exposition of the mathematical key, or slide rule, developed by William Oughtred. Published in 1682, this Latin text provides a thorough explanation of Oughtred’s groundbreaking invention and its applications. Beyond the slide rule itself, the commentary includes observations of the planets and instructions for constructing sundials and other horological instruments, showcasing the practical utility of mathematical principles in astronomy and timekeeping.Clerke’s work serves as a valuable resource for understanding the mathematical and scientific landscape of the 17th century, offering insight into the tools and techniques used by scholars and practitioners of the era. The book is of significant historical interest, highlighting the intersection of mathematics, astronomy, and technology during a period of rapid scientific advancement.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 from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
