Document gbkNjmZoQ8dZ4xonQwVRYL1D9

9 Norwood 12 September 22, 1944. Kettering Laboratory of Applied Physiology Eden & Bethesda Aves, Cincinnati, Ohio. Dear Sirs; Attention Mr. Cholak. To determine the efficiency of our air washer on Line 2, we are submitting herewith three samples for lead determination. A - 250cc 5f0 HNO^ through which air was aspi rated in an impinger tube; time, 80 minutes; rate, 4.7 liters per minute; air temperature average 82F. The sample was collected about two feet from the washer out let, near the center of flow. E - 250cc 5^ HNOj receiving the air that had already passed through A. Blank - 250cc 5% HNOg. Total cans run during the sampling, 22,100.