Copy letter from Herbert Rix, to Mr Oswald Stoll, The Empire, Cardiff 'In answer to your memo. of yesterday, we know nothing about Prof. Jevons' "Logical Machine" nor where you could see one, but he published a paper "On the Mechanical Performance of Logical Inference" in the "Philosophical Transactions of the Royal Society", vol. 160, (1870), in which he gives a description of a machine'. 9 October 1895