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"Royal Observatory, Greenwich"
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Variations of angular elements of the geomagnetic field in Europe during the last 24 centuries
The analysis of variations in angular elements of the geomagnetic field during the period since 350 B.C. to the present day according to the findings from the study of thermal magnetization of baked archaeological samples from England, France, and East Europe showed that the key feature in the behavior of the geomagnetic inclination in all three regions is a millennial variation. The trend in the behavior of the inclination of the geomagnetic field can be regarded as a manifestation of a variation with a characteristic time scale of several thousand years. Despite the general likeness of variations in inclination and declination of the ancient geomagnetic field, they also exhibit a noticeable dissimilarity. The paths of the virtual geomagnetic pole reconstructed from the variations of angular elements of the geomagnetic field in East Europe indicate that the geomagnetic polar motion is quasi-cyclic. The duration of the first cycle was about 1000 years, while the second cycle has not been completed due to the change of the motion to the opposite direction in the middle of the XVII century.
Journal Article
The secret agent : authoritative text, contexts, criticism
\"Set in London in 1886, The Secret Agent tells the story of Mr. Verloc, an agent provocateur for a mysterious foreign power. When Mr. Verloc is charged with bombing the Greenwich Observatory, his carefully crafted life unravels before his eyes. This Norton Critical Edition is based on the text of the first English book edition published in 1907. The text comes paired with explanatory footnotes and an introduction by the editor. \"Contexts\" includes a wide range of contemporary reviews of the novel, Conrad's short story \"The Informer,\" and further reading on anarchism and fin de siecle culture. \"Criticism\" compiles a range of approaches to studying the novel that spans from the late twentieth century to the present. Selections from Ian Watt, Terry Eagleton, Martin Ray, Hugh Epstein, Gail Fincham, Jacques Berthoud, Peter Mallios, and Michael Newton examine the novel through literary and political lenses that relate the work to the modern day. A Selected Bibliography is also included.\"-- Provided by publisher
Book
The Photography Era
AstrophotographyAlthough experiments with light-sensitive chemicals began in the early 19th century, it was not until the late 1830s that Louis Daguerre Daguerre, Louis in France and Henry Fox Talbot Talbot, Henry Foxin England found ways to indefinitely preserve an image on either glass or paper. Early emulsions required very long exposures, but by 1850 the daguerrotype process had been sufficiently improved for an image of the star Vega to be obtained using the 15-inch refractor at Harvard College Observatory.Harvard College Observatory
Book Chapter
A Noble Triumph—Surpassed: The 1874 Transit
On the eve of the 1874 transit of Venus, an educated person, looking back to the last such event in 1769, might well conclude that the intervening 105 years had seen greater changes to the world than in any previous interval of like duration. Some of the period’s events were literally revolutionary: the American Revolution, the French Revolution followed by the French Revolutionary and Napoleonic Wars, the Latin American Revolutions, and the Revolutions of 1830 and 1848. New nations had arisen in the Americas, including the United States, while in Europe both Italy and Germany had become unified.
Book Chapter