The only connexion between Portland cement and the place Portland is that the cement when set somewhat resembles Portland stone in colour.
True, it is possible to manufacture Portland cement from Portland stone (after adding a suitable quantity of clay), but this is merely because Portland stone is substantially carbonate of lime; any other limestone would serve equally well.
Although Portland cement is later in date than either Roman cement or hydraulic lime, yet on account of its greater industrial importance, and of the fact that, being an artificial product, it is of approximately uniform composition and properties, it may conveniently be treated of first.
The greater part of the Portland cement made in England is manufactured on the Thames and Medway.
Many different forms of kiln are used for burning Portland cement.
