In 1840, only fifty-six of these Cornish engines delivered nearly thirty-seven millions of tons of water.
Whole armies in number could not do a tithe of the labor.  In 1840, only fifty-six of these Cornish engines delivered nearly thirty-seven millions of tons of water.  The tin produce had increased (though the workings began many hundred years before Christ) from eighteen thousand blocks to thirty thousand of tin, and of copper from seven to eleven thousand tons.