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Heating Wheel Tires.
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Heating Wheel Tires.--In the workshops of the railway from Moscow to Nijni, the wheel-tires are plunged, by the help of a movable cran% into a metallic reservoir filled with water, which is kept boiling by the admission of steam from a neighboring boiler. After ten minutes immersion, the tire is put upon the wheel. The heat is more uniform than that which is given by fire, and the contraction is, consequently, more regular. In six years the water-treated tires only furnished one fracture, and less than one per cent. have become loosened upon the wheel.--Ann, des Ponts et Chauss. C.
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