Copy letter from Robert William Frederick Harrison, to Professor Augustus Edward Hough Love, Fellow of the Royal Society In a recent report by Love on a paper by Mr Filon, a passage occurs [typed below letter] stating that the author's list of those writers who have used curvilinear co-ordinates for the torsion problem omits McDonald 'The Torsional Strength of a Hollow Shaft', Trans. Camb. Phil. Soc., Vol XIV or XV. The author cannot find the paper in the stated volumes. Harrison queries if Love can correct the reference. 12 September 1899