| http://www.w3.org/ns/prov#value | - The arrangement for further recovery of heat shown in Figs. 4 to 6, and 8, and the arrangement for cooling the air during compression as well as after final compression are of advantage in certain types of systems where the nature of the operation is such that the increase in thermal efficiency obtainable by such arrangements justies the capital `cost of the apparatus necessary to effect such furt
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