Determination of Gravity at Stations in Pennsylvania, 1879-1880

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Excerpt from Determination of Gravity at Stations in Pennsylvania, 1879-1880: Appendix No. 19, Report for 1883Experiments were also made at this station upon the effect of substituting rollers for the knives as the bearings of the pendulum. The rollers were steel cylinders of 5mm diameter, backed by steel planes. They were well constructed by Messrs. Darling. Brown, and Sharpe. The utmost pains were taken (here as well as in later experiments in Baltimore) to avoid the inclusion of dust between the roller and its support. Nevertheless the decrement of the amplitude was very rapid for arcs above 035 of the radius on each side of the vertical, and the periods show enormous variations.The experiments on the effect of the bells of the Geneva support are also of interest, though they fail to give a very accurate evaluation of this constant.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.