Excerpt from Carpentry Of plane right triangles as a basis for developing generalized roof framing principles in Chapter IV. There is absolutely nothing in the use Of natural trigonometric functions to prevent their intro duction early in the mathematical experience Of a boy, except academic tradition. The author has made use Of this mathe matical tool with upper grammar grade boys with less effort upon their part in mastering the principles than was expended in master ing square root. The ease with which roof framing problems lend themselves to solution by the use Of natural trigonometric functions and the readiness with which problems may be generalized thereby has emboldened the author to make use of it in a text as elementary as this. NO previous knowledge Of trigonometry is presupposed, the Appendix provides all the information required for the solution of any problem given herein. Should a reader, because of lack Of time or for any other cause, not care to consider more than roof framing of the square cornered building, he will find a complete treatise in Chapter III without reference to solutions other than by common arithmetic. Appendix IV offers a still more abbreviated approach to both square and octagonal roof framing. The greatest good in studying the chapter on Estimating will come only when each student is provided with a set Of plans and specifications completely drawn, as by a practicing architect. Plans and Specifications, such as will serve the purpose, can be purchased at small cost from architectural companies, should local architects be unwilling to provide sets for the schools. Also, there must be provided for each student, catalogs of lumber and millwork specifications and prices. These can be obtained from mail order lumber and millwork companies. As a rule, local lumber and millwork companies are glad to provide such data, but it must be in a form complete. And readily accessible to be of the greatest value. 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.