Discussion of the Magnetic and Meteorological Observations PDF Download
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Author: Alexander Dallas Bache
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Author: Alexander Dallas Bache
Publisher:
ISBN:
Category :
Languages : en
Pages : 50
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Book Description
Author: Alexander Dallas Bache
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Author: Alexander Dallas Bache
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 80
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Author: Alexander Dallas Bache
Publisher:
ISBN:
Category : Geomagnetism
Languages : en
Pages : 24
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Author: Alexander Dallas Bache
Publisher:
ISBN: 9781334030062
Category : Science
Languages : en
Pages : 130
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Author: A. D. 1806-1867 Bache
Publisher: Palala Press
ISBN: 9781355058427
Category :
Languages : en
Pages : 138
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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: Alexander Dallas Bache
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: A. D. 1806-1867 Bache
Publisher:
ISBN: 9781354287484
Category :
Languages : en
Pages : 120
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Author: Alexander Dallas Bache
Publisher: Forgotten Books
ISBN: 9780331978896
Category : Science
Languages : en
Pages : 26
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Excerpt from Discussion of the Magnetic and Meteorological Observations, Vol. 1: Made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845; Investigation of the Eleven Year Period in the Amplitude of the Solar Diurnal Variation and of the Disturbances of the Magnetic Declination It is proposed in the present paper to investigate the law of the eleven year period, or as it is more frequently called, the decennial period, there being yet an uncertainty as to its precise length. It is supposed to have some direct or_ indirect connection with the solar spot period, which, according to late investigations by Prof. R. Wolf,2 is said to exhibit corresponding disturbances. The discussion is a contribution towards the determination of the epoch of the occurrence of a minimum (as to number and magnitude) in certain phases of the magnetic variations and disturbances, corresponding to a minimum in the solar spot period. The method of reduction is substantially the same as that adopted by General Sabine, and explained in his discussion of the Toronto and Hobarton3 observations. This longitude depends on that of Cambridge observatory, for which 411 44 has been adopted. 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.
Author: Alexander Dallas Bache
Publisher: Forgotten Books
ISBN: 9781333250072
Category : Science
Languages : en
Pages : 124
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Book Description
Excerpt from Discussion of the Magnetic and Meteorological Observations, Vol. 3: Made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845 In January, 1841, the Lloyd instrument was replaced by a re ecting vertical force magnetometer, made at my suggestion by Mr. J. Saxton. The bar of this instrument was two feet and one inch in length, two inches wide in the middle, one and a half near the ends, tapering to nothing at the ends, and a quarter of an inch thick. The magnet was of steel and hardened as perfectly as the maker could effect. By means of a ball moving on a fine screw, its equilibrium could be changed. The mirror projected outside the box, and the motion of the bar was observed by means of a telescope. At the top of the box was a piece of plate glass through which a thermometer (of Francis' make) could be read. For further particulars see p. Vii, of the preface to volume I of the record. For some time (between three and four months) after being put up, the bar lost considerably of its magnetic force, and after being in use four months, a movement of the adjusting ball upon the screw was required for placing the readings again near the middle of the scale. By this adjustment, the sensibility of the apparatus was not interfered with. 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."
