Science: Metallurgical Miracles

A patent for improved photographic technique was taken out in 1868 by a lady named Sarah A. L. Hardinge. In the 70 years which followed, she and her descendants took out 174 other patents. Mrs. Hardinge's smart son, Hal, for instance, invented a machine which pulverizes ore by feeding it into a whirling drum containing a lot of little steel balls. Many a fortune has been made with it. It became generally known last week that Mrs. Hardinge's smart grandson had added a smart refinement to his father's famed "ball process" of ore reduction....

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