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In the Philosophical Transactions, Numb. 93.p . 6015. amongst other Desiderata’s and Queries, are these:To endeavour to retrieve the Art of Hardning and Tempering of Steel, for cutting of Porphyry, &amp;c . We know not which way to rough-hew Stones of that untractable hardness.

IV. The manner of making steel, and its temper; with a gueβ at the way the ancients used to steel their picks, for the cutting or hewing of porphyry