Publications of the Yerkes Observatory, Vol. 3

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Excerpt from Publications of the Yerkes Observatory, Vol. 3: Part I, the Rumford Spectroheliograph of the Yerkes ObservatoryIt was with some such ideas in mind that the work of the Kenwood Observatory was undertaken in 1888. It seemed obvious that even a very slight appreciation of the subject should suffice to render possible some improvements of method. A first step in this direction was attempted by the invention of the spectroheliograph in 1889. The original purpose of this instrument was the photography of the chromosphere and prominences, in order to simplify and render more accurate the daily delineation of their form. It was subsequently found, as will be shown in the present paper, that the instrument had a far wider range of application, and that it could be applied in directions which had not suggested themselves in 1889.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.