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Flint grinding. Engraving of a mill for grinding flint for the manufacture of pottery. Flint was first added to clay pottery by the British inventor John Astbury in an attempt to make translucent, porcelain-like tableware. The first flint-grinding mill was built by Hanley in 1726. Flint is a silicaceous sedimentary rock. Image taken from British Manufactures, Chemical (1844) by G. Dodd.
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