Portland Cement

The manufacturers of Portland Cement are celebrating the 100th anni- versary of their industry.

It was in Leeds, England, 100 years ago, that Joseph Aspdin discovered that a new building material could be produced by mixing pulverized lime and clay in correct proportions and driving out the carbonic acid gas with heat. Aspdin was not a chemist or scientist; and his momentous discovery was made by accidental experimentation. Up until 1872, there was not a Portland cement plant in this country. Today the U. S. industry represents a...

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