to a variety of piece of plate glass of suitable size, and after careful was stronger than the strongest wrought iron pipe of tests to determine the quality of the welds, etc. In cleaning rub the surface with powdered talc, but leav- that class.'' This is explained by the fact that the cutting… … light receive the most undertaken this year to de- 8.-HYDRAULIC PIPE TESTING MACHINE. moisture, and consequent- termine the relative merits 11897 SCIENTIFIC AMERICAN, INC.
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