Excerpt from Determination of Stellar Parallax The observations upon which the present volume is based were made at the Cambridge Observatory (England) in the years 1903-1907, according to plans prepared for the stellar parallax work of that observatory by Mr. Arthur R. Hinks, chief assistant at the observatory, and the writer, who had been appointed a research assistant of the Carnegie Institution of Washington for the prosecution of the work whose results are here given. It was originally planned that all the observations should be made by the writer, but in the autumn of 1904 he was disabled by serious illness, and Mr. Hinks very kindly undertook their continuance. Upon the writer's recovery, his term as a research assistant had practically expired and he received a call to America for the following year. It was then arranged that Mr. Hinks should complete the photographic work (for which he and the writer are therefore jointly responsible in nearly equal proportions - 43 per cent being done by the former and 57 per cent by the latter). The methods of observation and measurement, detailed in Chapter I - so far as they contain anything new - are also the result of collaboration between Mr. Hinks and the writer. For the measurement and reduction of the plates, the discussion of the results, and the conclusions deduced therefrom (which together occupy the remaining chapters of this volume) the writer is alone responsible. The magnitudes and spectra of the stars have been determined at the Harvard College Observatory, under the direction of Prof. E. C. Pickering, to whom the writer is very greatly indebted for this valuable and generous contribution. It is also a pleasure to him to express his gratitude to Sir Robert Ball, Director of the Cambridge Observatory, and to the Observatory Syndicate, who did everything in their power to facilitate his work; to the members of the Observatory staff, for their cordial interest, and in particular to Mr. Hinks, for valuable comment and criticism and many kindnesses in addition to the invaluable collaboration already described; and finally to the authorities of Princeton University, for the time and instrumental means for completing the work there. 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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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.