Saw Tempering by Natural Gas.

Beaver Falls, Pa., contains several gas wells at an average depth of eleven hundred feet, yielding about 100,000 cubic feet of gas every twenty-four hours. This gas has been introduced into a large saw tempering furnace at that place in the works of Emerson, Smith & Co. The furnace is 8 feet wide by 14 feet long. It is said to be a perfect success, giving a uniform heat, and there being no sulphur or impurity in the gas the steel is not deteriorated in the operation of heating.