Magnetic Variation by J.B. Stone

Magnetic Variation in the United States: Being a Compilation of Observations Made in America from the Year 1640 to the Present Date; Tabulated and Arranged for the Use of Surveyors, With a Brief Account of the Nature of Terrestrial Magnetism, Its Various Theories as to the Origin, it’s Change in Intensity and Direction and the Progress of Magnetic Observation by J.B. Stone, published in 1878. Sections Include: Researches of Halley, Humboldt and Ross, Magnetic Crusade of 1835, First Compilation in America, Causes of Terrestrial Magnetism, Theories of Mayer, Gauss, Ampere and Norton, Magnetic Storms, Magnetic Intensity, etc. etc. Hardcover with gilt lettering with light shelfwear to corners and ends. Original owners library stamp and name in fountian pen on front endsheet.