Russian navy screw steam launch in 1869

The Engineer dated 19 February 1869, p. 136

The launches were attached to ironclads lying in Cronstadt and were made of iron fitted with air-boxes at each end with the option to add more air-boxes under the seats. Dimensions 35 x 6.3 x 2.6 (dra
ught aft)-1.3 (draught fore) feet. The vertical boiler had Field's tubes and the single engine supplied at 300 rpm 85 lb steam allowing a speed of around 7.5 knots. While engine and boiler were attached to each other it was possible to replace the propulsion at once. Weight engine+boiler was 17.5 cwt and the weight of a complete boat was 32.5 cwt.