Industrial Production Jumps 0.5 Pct - Fed Friday August 15, 9:19 am ET WASHINGTON (Reuters) - U.S. industrial output in July posted its biggest gain since January, boosted by a big gain in utilities output and a third straight monthly rise in factory activity, the Federal Reserve said on Friday. Production at factories, mines and utilities jumped a larger-than-expected 0.5 percent, the Fed said, its biggest rise since January's 0.7 percent gain. Firms also ran at a faster 74.5 percent of full capacity in July, up from 74.2 percent in June. Wall Street analysts had expected production to post a...