Vectors and rotors with applications by O. Henrici ... and G.C. Turner ... Henrici, O. (Olaus), 1840-1918. Turner, G. C. (George Charles), joint author. Vector analysis. Graphic statics. QA261 .H5 A13977 HEV London, E. Arnold [1903] [1903] 1903 Text xv, 204 p. eng