id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
16792	Various	Scientific American Supplement, No. 508, September 26, 1885			.txt	text/plain	38044	1970	70	shaft at a depth of 1,600 ft., up to which point all the water called "natural level" The work was not easy until a depth of 111 feet most efficient heat-engines, converting into power a large percentage As only a small portion of heat reached the compressed air, the loss a high-pressure engine, or the heated gases and water passing away me to suppose that the heating power of ordinary coal gas was higher with gas of similar heating power, 18 cubic feet have given 1 This engine (which, in an improved form, uses only about 20 cubic feet effective; but this engine works with only 18 to 22 cubic feet of gas In the same way if I heat air or water, I communicate horse power, by a steam-engine indicator; the useful work, by a Prony water-power or natural gas and marine engines of great capacity.	./cache/16792.txt	./txt/16792.txt