Illustrations of the external appearance of the torpedo boat engines illustrated in 'Torpedo boats for the Russian Government.' The Engineer, vol. 57, 13 June 1884, pp. 442 and 453.' These inverted-vertical marine engines 10-inches by 18-inches by 12-inches stroke were of the lightest possible construction, gunmetal and steel being used almost exclusively except for the cylinders, which were of cast iron.