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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1845 edition. Excerpt: ...36.2 30.3 30.7 25.7 34.4 36.5 37.6 MAGNETIC OBSERVATORY AT I'll I: GIRARD COLLEGE, PHILADELPHIA. TERM DAY MAGNETIC OBSERVATIONS, FROM JUNE TO DECEMBER, 1840. GENERAL NOTES. The instrumente are thotc previously described in the notes pretixed to ordinary observations. Observations upon term days were commenced in 1839 with the declinometer only. On the term day of May, 1840, all the instrument were mounted, but the vertical force was not permanently adjusted. A remarkable aurora occurred, and, simultaneously, a great magnetic disturbance-I have therefore inserted the record of the observations, though, in reference to the vertical force, the value of the differences on the scale was not ascertained. The observations of the force instruments are uncorrected for temperature. In a subsidiary building. Augmented value of one division, 0'.345. Increasing readings correspond to decreasing declination. 10 P. M. Gottingen time, civil reckoning. f 1 minute 1 second too slow. The disturbance having carried the needle out of the field, the sensibility of the instrument was diminished by lowering the centre of gravity. As the twilight tailed an aurora became visible. In the course of the display, there were moving pillars, flashes from a low segment of light in the north, and a beautiful arch nearly or quite at right angles to the magnetic meridian. Pillars of aurora from 9A. 18m. to WA. 2m., varying in brightness and position;low segment of light to north, continued throughout the appearances; 10A. 5m., an arch forms from east to west; streamer of light, varying in brightness, fading and reappearing from 10A. 20m. to about IIA. 10m.; the brightest flashes at Uh. 6m. See general notes. Not.--The declinometer is a...

Public Documents Printed by Order of the Senate of the United States, Second Session of the Twenty-ninth [i.e. Twenty-eighth] Congress, Begun and Held at the City of Washington, December 2, 1844, in the Sixty-ninth Year of the Independence of the United States. Embraced in Eleven Volumes. Supplement to Volumes 4, 5, and 6, (containing No. 97,) Being the Plates of Curves Illustrating the Magnetic and Meteorological Observations, &c

United States. Congress. Senate

Published: 1845

Total Pages: 216


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Excerpt from Public Documents Printed by Order of the Senate of the United States, First Session of the Twenty-Eighth Congress, Begun and Held at the City of Washington, December 4, 1843, in the Sixty-Eighth Year of the Independence of the United States, Vol. 1 of 7: Containing Document No. 1 Green. Report of the Committee on Naval Affairs on the petition of George Rip, praying a renewal of the pension of Margaret F. 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.