Document yrN7b3kq0aJkbrkjNN1apY1B4

August 5, 1938 Hr. D. J. Bussey, General Superintendent Experimental Test Department Pratt and 'Whitney Airoraft Bast Hartford, Conn. Dear Bussey: `'any thanks for yours of August 3 concerning spark plug cleaning, We should bo interested in knowing from just what part of the spark plug cleaning apparatus tho dust sample forwarded with your letter of July 2Qwas collected. This 5.nfomation will give us some idea of the adequacy of the ventilating system described in your letter of August 3. I hope to be at Pratt and Whitney within the next few weeks and should very much like to inspect the apparatus in question. Yours very truly, SDIi:GPM CC: Dr. Maehle '' 0009095 Mr. S* D. Huron Ethyl Gasoline Corporation Research Laboratories 723 East Milwaukee Ave. Detroit, Michigan . Dear !5r. Heron: In reply to your letter of July 23 regarding the possible health, hazards connected with our spark plug cleaning opera tion, the cleaning fixture is a double ended grinder with a chuck at one end and a wire brush whaol at the other sad. The duct froxa tha blower is connected by a Yto ducts which cover both ends of this grinder. The dusty air is discharged 20 feet above the ground level and the vacuummeasured at the Y is 8.2 H20. If you require further information we will b glad to furnish It. Thank you very rauoh for your comments. Very truly yours, PRATT h Vi'ITHEYAIRCRAFT SJBiQTg ccs Dr. W. F 2&.chle E. J. Bussey . General Superintendent ~ Experimental Tost Department K 0009096 N9910.01