. On these illustra- required 130 pounds to run the mills at full speed, and that goods, in 1872. They were bought by the National Tube tions may be traced the distribution of the fragments of they were working at about 125 pounds at the moment of Company, in 1879, and placed in the Keystone Mills… … 5.-PrIncipal part of No. 5 boiler, which was thrown over the church on the blujOf. 6. -Principal part of No. 6 boiler, that struck the copper works, ete. Fig. 2.-EXPLOSION OF TWO STEAM BOILERS AT THE KEYSTONE ROLLING MILLS, PITTSBURG, PA. > 1882 SCIENTIFIC AMERICAN, INC
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