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DIMENSIONS OF BOILER FOR CONSTRUCTION The volume of the boiler will be : Steam space .81 x 75 = 60.75 cubic feet.

71X 7.07 x 16 x 12 Tube space = 55.'77 cubic feet. 1728 Water space .81 X 75 x 2 = 121.5 cubic feet.

Total space 238.0'2 cubic feet. Since the tubes are 16 feet long the area of the end will be 238.02 — 14.8i square feet.

16 This area gives a diameter of about 41 feet or 52 inches. We will make the boiler 41 feet or 54 inches in diameter. Then the boiler will be 16 feet long and 54 inches in diameter ; with 71 tubes 3 inches in diameter. For moderate power, a common rule is to make the length about 31 times the diameter ; by this rule our boiler is 3.55 times