New & rev., ed., 1941. 408 + 20 pp., frontis., + 63 photo & other plates (with a further four printed on these but not called for) + 2 diagrams. Rebound in black cloth ; gilt ; 22 x 14cm. 1 stamp to prelim, Medical Research Council, Physiological Laboratory, A.F.V. School, Lulworth Camp, Dorset, + 1 small surname + occasional informative pencil notes o/w V.G.+. The author was a rear-admiral in the Royal Navy who was influential in the formation of the Royal Naval Air Service. His interest in the armoured car led him to improve the design by fitting it with caterpillar tracks that enabled it to travel cross-country. From this advance it was only a short step to the development of the tank in which the author thereby became involved. The author promoted the use of armoured cars for the defence of airfields in France during the Great War. After the stalemate of the trenches developed, the cars were sent to Russia and Egypt. This book provides a record of RNAS caterpillar experiments that led to the evolution of the tank. First published in 1937, this new and revised edition of 1941 includes some extra photograph plates and updated information. SCARCE.