Introduction to quaternions, the late professors Philip Kelland and Peter Guthrie Tait. Kelland, Philip, 1808-1879. Tait, Peter Guthrie, 1831-1901, joint author. Knott, Cargill Gilston, 1856-1922, ed. Quaternions. QA257 .K3 516.82 KEI London, Macmillan ; New York : Macmillan, 1904. 1904. 1904 Text xvii, 208 p. : eng