By 1870, Britains steam engines generated 4 million horsepower, equivalent to the work of 40 million men, whoif industry had still depended on muscleswould have eaten more than three times Britains entire wheat output.
By 1870, Britains steam engines generated 4 million horsepower, equivalent to the work of 40 million men, whoif industry had still depended on muscleswould have eaten more than three times Britains entire wheat output.