http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f223-subject=Compass) http://norton.wrhs.org/collections/search?docsPerPage%3D100;f223-subject%3DCompass Results for your query: docsPerPage=100;f223-subject=Compass Thu, 01 Jan 1970 12:00:00 GMT Abstract of a discussion of the influence of the moon on the declination of the magnetic needle: from the observations at the Girard College, Philadelphia between the years 1840 and 1845. Bache, A. D. (Alexander Dallas), 1806-1867, Girard College Magnetic and Meteorological Observatory. http://norton.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc http://norton.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc Thu, 01 Jan 1970 12:00:00 GMT On the origin of clockwork, perpetual motion devices, and the compass. Price, Derek J. de Solla (Derek John de Solla), 1922-1983 http://norton.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc http://norton.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc Thu, 01 Jan 1970 12:00:00 GMT