Note 22b — A LETTER, &c.
Reading edition
In the best of the large stationary engines now made, a bushel of coal will do the work of 44 horses for an hour. Therefore to make a current of air which should be capable of conveying 10,000 tons 100 miles in an hour, would require 43 bushels of coal: which is not twice so much as some steam vessels burn in the same time.