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Excerpt from The Elements of Plane Trigonometry IN this treatise on the Elements of Plane Trigonometry the subject is divided into three parts, dealing respectively with arithmetical, real algebraical, and complex, quantity. Such an arrangement appears to be a natural one, and has the advantage of introducing the new names and formulae that belong to the subject before the student encounters the difficulty of the application of signs to denote the sense and direction of lines. Part I. Is further simplified by the postponement of the treatment of the circular measurement of angles. For many practical purposes, in surveying and in the applica tion of trigonometry to elementary mechanics, the short introduction to the subject comprised in Part I. Will be found useful. The immediate substitution of the real for the tabular logarithm of the trigonometrical ratios was recommended by Professor De Morgan, and seems likely to be generally adopted as the simpler method in teaching and the more expeditious and more accurate one in working. 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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