Excerpt from Determination of the Parallaxes of Fifty Stars, and Description of the Instruments and of the Methods EmployedThe major part of the observing energy of the staff of the Sproul Observatory has for some time been devoted to the de termination of Stellar Parallax. I' have given in the following pages a brief description of the instruments used, the methods of observing and reduction that have been employed, and the results, together with the data of observation and measurement, for fifty stars.These results have been obtained through the efforts of sev eral persons. The work has been prosecuted according to plans outlined by the writer. Associated with him at various times have been Dr. Samuel G. Barton, Hannah B. Steele, john H. Pitman, and the Reverend \'valter A. Matos. Doctor Barton, Mr. 'pitman, and the writer have given during the time the work was in progress the major part of their efforts to other college duties, each having had a comparatively heavy teaching roster. Miss Steele also had some other college duties.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.