Bears four diagrams, courtesy of The 'Motor', and much explanatory text re the working cycle of the rotary engine invented in 1954 by German engineer Dr Felix Wankel. Poster: "Castrol guide to the Wankel four-stroke rotary engine"
Bears four diagrams, courtesy of BSA Motor Cycles Ltd, and lengthy list of recommended grades of oils for two-stroke motor cycles, scooters and mopeds. Poster: 'Castrol guide to the two-stroke cycle'
Marked: 'This chart has been checked by the Ford Motor Co., Dagenham, Essex' Ford Consul Corsair lubrication chart
