Engine Stack Exhaust open, Manometer #1 readings of 3.874.1 = 7.9" of water, or .285 lbs/sq. in, closed, Auxiliary Exhaust open. Stack Exhaust Manometer #1 readings of 1.4/1.6 = 3.0" of water, or .1083 los/sq. in. mananeter #2 readings on Aux, Exhaust outlet = 040 Engine Stack Exhaust Closed, Auxiliary Exhaust open, nanometer #1 readings 1.6/1.5 = 3.1" of water, or .111 lbs/sq. in, Mano- meter #2 reading on Aux. Exhaust outlet 0.0/0.5" of water, or .0018 lbs/sq. in. 3. Engine#3 Stack Exhaust closed, Auxiliary Exhaust open, mancmeter #1 readings 2.32.6 = 4.9" of water, or .1768 lbs/sq. in. mano- meter #2 reading on Aux. Exhaust outlet = 0,0-.15 = .15" of water, or .0054 lbs/sq. in. vaccuum. After the three units had run for a period of ten minutes, 2xhausting out the auxiliary exhaust system, the follow- ing results taken in reverse of the first, were obtained: Time1100 Engine #3 Manometer #1 reading 2.4/2.7 = 5.1" of water, or .184 lbs/sq. in, manometer #2 reading at Aux. Exh. outlet = -.15-.15 = -.30" of water, or .01083 lbs/sq. in. vaccuum. Engine #2 Engine #3 Exhausting to stack, Engine #1 & 2 on Aux, Exh., manometer #1 reading 1.7/2.0 = 3.7" of water, or .1335 lbs/sq. 5-319