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More than 5000 entries on the history, culture and life of Britain (published in 1993 by Macmillan, now out of print)
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Portland cement
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The standard modern cement, differing from earlier varieties in that the mixture of limestone and clay (or shale) is heated in manufacture; the resulting cement will harden even underwater. It is so named because Joseph Aspdin, taking out a patent for it in 1824, maintained that its colour when set resembled the very desirable Portland stone.
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