Mumbai, Sept. 2 -- August saw the upturn in the global manufacturing sector gain impetus, as rates of expansion in output, new orders and employment all gathered pace. The outlook also remained positive on balance, with business optimism at its joint- highest level since February. The J.P.Morgan Global Manufacturing PMI, a composite index produced by J.P.Morgan and S&P Global Market Intelligence in association with ISM and IFPSM rose to a three-month high of 52.3 in August, up from 52.1 in July, remaining above its neutral 50.0 mark for the thirteenth consecutive month. The five PMI sub-components were all at levels consistent with an improvement in overall operating performance in August. Alongside growth of output, new business and employ...