Excerpt from A Treatise on Screw Propellers and Their Steam-Engines: With Practical Rules and Examples How to Calculate and Construct the Same for Any Description of Vessels, Accompanied With a Treatise on Bodies in Motion in Fluid In this treatise on screw-propellers and the engines employed to drive them, the Author offers the results of several years' experience and observation respecting their performances. One of the objects aimed at has been to obtain formulæ to follow the variations that arise in practice; which formulæ are here introduced and exemplified. Theory and philosophy have been followed as far as they correspond with results; but, when they were found to differ, proper co-efficients were introduced to make the formulæ simple and practical. The difference between theory and practice may have arisen from circumstances not fully understood, and which, if entered into, might complicate the calculations with no remuneration. Algebraical formulæ may appear difficult to those not used to their application; but, when they are accompanied by examples, almost any one can insert numerical values and perform the computation. Algebra is becoming every day more popular, and will soon be a stranger to none who are at all interested in calculations. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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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.