Letter from Sir Frederick Abel to Lord Rayleigh Enclosing three statements referring to Hermann Sprengel's dispute with Abel over recognition of the discovery of the explosibility of wet guncotton through cumulative detonation. The three statements are: a Memorandum disagreeing with Sprengel's statement to the Royal Society on the matter; a note from Abel's laboratory assistant EO Brown dating from 1872 on carrying out experiments with wet guncotton and a official letter from the Director of Artillery at the War Office (19 November 1872), in which Brown's original experiments are reported. 13 December 1892