Andrew Carnegie：Autobiography of Andrew Carnegie, Additional Excerpt 277

It is hardly believable that for several years we were able to dispose of the highly phosphoric cinder from the puddling furnaces at a higher price than we had to pay for the pure cinder from the heating furnaces of our competitors--a cinder which was richer in iron than the puddled cinder and much freer from phosphorus. Upon some occasion a blast furnace had attempted to smelt the flue cinder, and from its greater purity the furnace did not work well with a mixture intended for an impurer article; hence for years it was thrown over the banks of the river at Pittsburgh by our competitors as worthless. In some cases we were even able to exchange a poor article for a good one and obtain a bonus.

Source： https://www.gutenberg.org/ebooks/17976
Locator：Additional excerpt 277 · Verified：2026-10-19 · Verification：Short excerpt

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