In Search of the Magnetic North: a Soldier-Surveyor’s Letters from the North-West, 1843–1844

by John Henry Lefroy

171 pages, Hardcover

Published January 1, 1955

About the author

Sir John Henry Lefroy, KCMG, CB, FRS, (28 January 1817 – 11 April 1890) was a British military man and later colonial administrator who also distinguished himself with his scientific studies of the Earth's magnetism.- Wikipedia