Letter from [Alan Archibald Campbell] Swinton, to E. H. R. Trenow [Esquire] Acknowledges receipt of a previous letter on the use by the A. E. C. Company of crude oil for motor car work and informs he contacted [Harry Ralph] Ricardo thereon. Following a meeting with Ricardo, confirms that he placed no importance to it and that he would not recommend the use of crude oil for motor cars because the fumes would be very unpleasant. 7 January 1930