| Citation | Royal Astronomer of Ireland. Andrews Professor of Astronomy in the University of Dublin. Edited in 1901 a second edition of Hamilton's 'Elements of Quaternions' in two vols, to which he has contributed an appendix containing extensions and important developments . Is also the author of many papers on Quaternions and other branches of Mathematics, among which the following may be specified: - 'Quaternions and Projective Geometry' (Phil Trans, A, 1903); 'The Theory of Linear Vector Functions' (Trans Roy Irish Acad, vol xxx, Pt XVI); 'Some Properties of the General Congruency of Curves' (ibid, vol xxxi); 'The Interpretation of a Quaternion as a Point Symbol' (ibid, vol xxxii, Section A, Pt I, 1902); 'Quaternion Arrays' (ibid, vol xxxii, Section A, Pt II, 1902); 'Representation of Screws by Weighted Points' (ibid, vol xxxii, Section A, Pt IV, 1902); 'The Quadratic Screw System: A Study of a Family of Quadratic Complexes' (ibid, vol xxxii, Section A, Pt VII, 1903); 'The Geometry of a Three-system of Screws' (ibid, vol xxxii, Section A, Pt VIII, 1903); 'Astatics and Quaternion Functions' (Proc Roy Irish Acad, ser 3, vol v); 'Integrals depending on a Single Quaternion Variable' (ibid, vol xxiv, Section A, Pt I, 1902). |