Books with author William Frederick 1859-1958 Durand

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.

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ... noted experimentally, and have been made the subject of quantitative measurement in a series of experiments carried on by the author. This is what is frequently referred to by the statement that the addition of thickness results in a virtual increase of pitch, because if the equivalent pitch be taken as (longitudinal speed for zero thrust)--(revolutions), the result will be greater than that derived by the measurement of the driving-face, and the excess would be still greater could the tangential forces be eliminated. We have thus discussed various possible definitions of mean pitch and mean slip in order to show the variety of meaning which may be given to these terms, and the consequent inexactness of significance attending their use without some agreement as to the basis of definition. Our use of the equations of § 36 will virtually assume the definition of mean slip as based on (e). That is, we shall assume, as will be Carnegie Institution. Publication. Number 79. explained later, that for the actual variable slip may be substituted some constant equivalent value for use in the equations giving the value of the total useful work. In regard to propellers of variable pitch it may be noted that such design is usually intended to provide for some variable distribution of slip over the surface, assuming the propeller to work in a uniform stream. When, however, we remember the great variability of the stream or wake, it is quite evident that any attempt to secure any specified distribution would be entirely futile, and that in any given case the actual distribution will be quite different from that intended. Hence any effects resulting from a variable pitch will be quite accidental, and it is very doubtful if, in the present state of...

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.