The text of R. J. Butler's paper 'On the steam trials of the "Satellite" and "Conqueror" under forced draught.' read before twenty-fourth session of the Institution of Naval Architects in 1883. The advantages that had been obtained in torpedo boats and other small craft fitted with a single boiler, by the successful employment of forced draught by fans in closed boiler rooms, had naturally induced the designers of war ships and their machinery to endeavour to secure similar advantages, by the application of the same system on a larger scale to the common high-pressure boilers, which were usually fitted in such ships.