Re the blast pipe; Mr Warren's book; 'battle of the blast pipe'; John Wesley Hackworth's influences, ‘he had one failing (in common with the late C.E. Strettons) in that he persuaded himself that certain things were true, and then he thoroughly believed they were true’; Stretton, suggest review implied Hackworth Stephenson not a man of integrity or genius; R.G. Sekon, other historical debate.