books.google.com - Henry Frederick Baker (1866-1956) was a renowned British mathematician specialising in algebraic geometry. He was elected a Fellow of the Royal Society in 1898 and appointed the Lowndean Professor of Astronomy and Geometry in the University of Cambridge in 1914. First published between 1922 and 1925,...http://books.google.com/books/about/Principles_of_Geometry.html?id=rxzb0qziGIgC&q=tangential+equation&utm_source=gb-gplus-sharePrinciples of Geometry
