Excerpt from Mathematical Tables: Comprising Logarithms of Numbers, Logarithmic Sines, Tangents, and Secants, Natural Sines, Meridional Parts, Difference of Latitude and Departure, Astronomical Refractions, &C To obtain the cosine of 31 Degrees 16' 12 The cosine of 31 Degrees 16' From this subtract t of 00007 68, which gives the cosine required. 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.