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an additional air chamber in increasing its capacity to 4 times Then two mouth pieces to be made one with a single and another with a double read The quantity of water used was nearly 48 cubic feet per 8 hours or 6 feet per hour equal to a six horse power engine. The blowing taking place [[end page]] [[start page]] [[page number in pencil]] 49 In the use of the Steam Boiler a supply of pure water must be had otherwise the apparatus will soon get out of order [[line]] once in a minute instead of 3 times gives 18 times the power of the steam required to blow the whistle more than the trumpet