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Excerpt from Mathematical Instruments, Vol. 2: Their Construction, Adjustment, Testing, and Use Valuable assistance has been received from several eminent Opticians, and more especially from Messrs. Parkes and Son, of Birmingham, who supplied the author with many capital instruments for examination, and from Messrs. R. And J. Beck, who have furnished several of the illustra tions, including that of the admirable first class microscope of 1their construction, which forms the frontispiece to this vo ume. 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.