Excerpt from Practical Optics for the Laboratory and Workshop This little book has been written primarily as a course of instruction for the student in Practical Optics; and secondly, to deal with the more recent practical applications of Optics for use in the optician's workshop. The exercises contained in the book are compiled from a series of experiments through which students in the Optical Engineering Department of the Imperial College of Science (South Kensington) usually pass before proceeding to the more advanced optical work of the department. It commences with the quite elementary work and covers a considerable amount of ground, and should, I think, prove a useful laboratory course in Light for Colleges and Schools of Science. The experiments involve as little expensive apparatus as possible, but at the present day satisfactory experimental optics demands somewhat better apparatus than the rather old-time favoured piece of wood and card, and therefore it has been partly the aim in these pages to suggest means of producing such apparatus in the best possible way. Although some of the devices mentioned are not yet to be found on the market, I have given scale drawings of such things (as, for example, optical benches), all of which have been found thoroughly practical, so that those who have a small workshop available may construct necessary apparatus for themselves. 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.