Publisher's Synopsis
Excerpt from On the Adjustment and Testing of Telescopic Objectives
Nco ura ged by the favourable reception accorded to previous editions of this book, in printed reviews, in many private letters received from astronomers, and as attested by the fact that it has been deemed worthy to be translated into several foreign languages, we have thought ourselves justified in issuing a third edition.
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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.
