A Concise Essay On Magnetism: With An Account Of The Declination And Inclination Of The Magnetic Needle; And An Attempt To Ascertain The Cause Of The Variation Thereof by John Lorimer. This historical-scientific treatise surveys the nature of magnetism, explaining the differences between natural and artificial magnets, and describing the magnets’ poles, terrella experiments, and the method by which iron becomes magnetized. It traces the early discovery of magnetism, the invention of the mariner’s compass, and the concept of lines of no declination and the Halleyan curves that govern the variation of the magnetic needle. The work combines observations, extracts from classical authors, and personal reasoning to explain how the earth acts as a giant magnet and how the needle’s direction can deviate due to the earth’s magnetism. It concludes with a discussion of diurnal and longer-term variation, and the ambition to prognosticate changes in navigation magnetic phenomena.
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