Show the largest steam boiler bluit Is said to be thu the largest holler in the world Is now being installed in pittsburgh pa by a company which supplies heating service in tile downtown down town business district there are six il miles of four inah tubing in the floating anil condensing tubes of abbi apparatus with a heating surface of square feet about three fourths of an acre the boiler bollar Is rated at horsepower horse by the ordinary system of rating but Is capable of operating continuously at three times tills this capacity and for short periods at four unies this rate when hatfull at full load it evaporates 9 00 tons tona of water per hour |