507 mechanical movements mechanisms and devices pdf

 

THE need of a complete assortment of illustrations and descriptions of MECHANICAL MOVEMENTS has lengthy been severely felt by artisans, inventors, and college students of the mechanic arts. It was the information of this need which induced the compilation of the gathering right here offered. The actions which it comprises have been already illustrated and described in occasional installments scattered by way of 5 volumes of the AMERICAN ARTISAN, by the readers of which their publication was obtained with a lot favor as was believed to warrant the expense of their replica with some revision in a separate quantity.

 

The selection of the movements embraced in this collection has been made
from many and various sources. The English works of Johnson, Willcock,
Wylson, and Denison have been drawn upon to a considerable extent, and many
other works—American and foreign—have been laid under contribution ; but
more than one-fourth of the movements—many of purely American origin—
have never previously appeared in any published collection.

 

Although the
collection embraces about three times as many movements as have ever been
contained in any previous American publication, and a considerably larger
number than has ever been contained in any foreign one, it has not been the
object of the compiler to merely swell the number, but he has endeavored to
select only such as may be of really practical value ; and with this end in view,
he has rejected many which are found in nearly all the previously published
collections, but which he has considered only applicable to some exceptional
want.

 

Owing to the selection of these movements at such intervals as could be
snatched from professional duties, which admitted of no postponement, and to
the engravings having been made from time to time for immediate publication,
the classification of the movements is not as perfect as the compiler could have
desired; yet it is believed that this deficiency is more than compensated for by
the copiousness of the Index and the entirely novel arrangement of the illustrations and the descriptive letter-press on opposite pages, which make the
collection—large and comprehensive as it is—more convenient for reference
than any previous one.