""A New Theory, Accounting For The Dip Of The Magnetic Needle"" is a book written by James Barlow in 1835. The book is an analysis of terrestrial magnetism and provides a solution for the lines of variation and no variation. The author proposes a new theory to account for the dip of the magnetic needle, which was a phenomenon that had puzzled scientists for centuries. Barlow's theory is based on the idea that the Earth's magnetic field is caused by...