id author title date pages extension mime words sentences flesch summary cache txt 15468 Caithness, James Sinclair, 14th earl of Lectures on Popular and Scientific Subjects .txt text/plain 36900 1384 70 steam-engine boilers, and coking coal, employed for making coke and gas. of vegetation--the great heat of the ground causes water to rise rapidly coal were brought up in the same time, and thus the water raised The great difficulty in working coal, should these upper seams fail, is the great man who brought this mighty power to bear on the vast The mind of a great man is called into action, and by applying state that all-powerful and most useful machine, the steam-engine. describes a means of raising water by the pressure of steam. raise water to drive mill-wheels--fancy erecting a steam engine now, of The weight of steam is about 1800 times less than water. first use of the steam-engine was simply to raise water from mines, and steam-engines were used to raise water that had passed over the wheel, generates great heat; and this is due to its attraction for the water. ./cache/15468.txt ./txt/15468.txt