Determination of the Mean Declinations of 136 Stars for the Epoch 1912. 0

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Excerpt from Determination of the Mean Declinations of 136 Stars for the Epoch 1912. 0: A Thesis Presented to the Faculty of the Graduate School of the University of PennsylvaniaThe value of one revolution of the micrometer screw was determined by turning the instrument 90 degrees in azimuth, so that the movable thread was parallel to the meridian, and observing the times of transit of a star as it passed horizontally across the field. The _movable thread was first placed near that edge of the field at which the star would first appear, the micrometer head being set at an even reading, and the time of transit was recorded on the chronograph. The thread was then moved forward two revolutions, another transit was recorded, and this was repeated throughout the field, 26 transits being thus taken for each star. From the results of observations on 34 stars the value of one revolution was found to be.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.