Date: 1835
lifted one foot high by each bushel of coals consumed, will be nearer the actual result in practice.  In 1832, there were sixty-four steam en gines in Cornwall, four of them the largest ever made : at that time, the consumption of coal at these engines was 84,000 bushels per month, or 2,800 per day ; the effect of the steam generated by the combustion of this fuel in draining the mines, was reckoned to be equal to the work of 44,000 horses.  Some esti mate of the advantages derived to our inland and coast navigation, in consequence of the facility and economy with which coal is obtained for the genera tion of steam on board vessels, may be formed from