Observations Made at the Magnetic and Meteorological Observatory at St. Helena, with Discussions of the Observations at St. Helena, the Cape of Good Hope, the Falkland Island, Carlton Fort in North America and Pekin PDF Download
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Author: Saint Helena. Magnetical and Meteorological Observatory
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Category :
Languages : en
Pages :
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Author: Saint Helena. Magnetical and Meteorological Observatory
Publisher:
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Category :
Languages : en
Pages :
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Author: Sir Edward Sabine
Publisher:
ISBN:
Category : Geomagnetism
Languages : en
Pages : 526
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Author: Magnetical Meteorological Observatory
Publisher: Forgotten Books
ISBN: 9780484641401
Category : Science
Languages : en
Pages : 686
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Excerpt from Observations Made at the Magnetical and Meteorological Observatory at St. Helena, Vol. 2: With Discussions of the Observations at St. Helena, the Cape of Good Hope, the Falkland Islands, Carlton Fort in North America, and Pekin; 1844 to 1849 Declinometer (continued from Vol. I. P. - The declinometer remained undisturbed in the double rectangular box in which the magnet was enclosed in July 1843, and with the adjustment made in March 1844, until the termination of the duties of the Observatory by the recall of the detachment of the Royal Artillery in May 1849. The hourly series of observations commenced in September 1842 was maintained until the end of August 1847, completing five years, during which the declinometer was undisturbed, except on two occasions, viz., firstly on July 24, 1843, when the cylindrical wooden case in which the magnet had been previously suspended was replaced by a double rectangular box, as a more effectual provision against currents of air; and secondly in January 1844, when the suspension thread which had been in use since February 1842 broke, and was replaced by a new thread, with which the observations were recommenced in March 1844. On the first of these two occasions, the continuity of the series was unbroken, great care having been taken to avoid any interference with the magnet or its suspension on the second, the continuity was interrupted, by reason of a half turn having been accidentally left in the suspension thread in the adjustment of March 1844. (vol. I. P. The hourly series of five years consists thereof of two independent portions, viz., from September 1, 1842, to the fracture of the suspension in January 1844, and from the replacement of the suspension thread in March 1844 to the termination of the series on August 31, 1847. To connect the mean monthly declinations derived from the scale readings during the second portion of the five years with those of the first portion, a constant correction of - 6'°o has been applied to the second portion, in compensation of a half turn in the suspension subsequent to march 1844. With this correction the mean scale readings, which are collected from the monthly tables, give the following values for the mean declination in each month those of January and February 1844, during which months the Observations were suspended, are marked in Table I. By an asterisk, having been interpolated from the values in December 1843 and March 1844. 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:
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Category :
Languages : en
Pages : 526
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Author: Edward Sabine
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Category :
Languages : en
Pages :
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Author: Johan de Beer
Publisher: AFRICAN SUN MeDIA
ISBN: 1920689818
Category : Technology & Engineering
Languages : en
Pages : 648
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Geophysics is a comparatively young science which only evolved as a distinct discipline during the 19th century. However, its phenomena (like earthquakes, tsunamis, volcanic eruptions and lightning) had been objects of fear, curiosity and speculation since ancient times. In this book, Johan de Beer and his research team reveal that geophysical activity in South Africa can be traced back to as early as 1488. This is a truly astonishing revelation which deserves to be firmly entrenched as part of the country's proud history. The book also discusses the history and formation of South African geophysical institutions that made a huge and seldom acknowledged contribution to the technological development of southern Africa.
Author: Royal Meteorological Society (Great Britain)
Publisher:
ISBN:
Category : Electronic journals
Languages : en
Pages : 786
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Vols. 10-11 include Meteorology of England by James Glaisher as seperately paged section at end.
Author: John Palliser
Publisher:
ISBN:
Category : Canada
Languages : en
Pages : 348
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Author: Magnetical and Meteorological Observatory (Saint Helena)
Publisher:
ISBN:
Category :
Languages : en
Pages : 696
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Author:
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ISBN:
Category : Civil engineering
Languages : en
Pages : 694
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