Document vyrDkKJzEE8wx9jeaDoV86Y8

Et h y l Ga s o l in e Co r p o r a t io n Re s k Alton La b o r a t o r i re s 723 Ea s t Mil w a u k e k Av h n t k De t r o it , Mic iiig a x July 29, 1938. Dr. W.F. ^aohle College of Medicine University of Cincinnati Cincinnati, Ohio. Dear Machle; Some time ago I found that Pratt and Whitney were removing lead deposit from spark plug cores with sand-paper. This operation wa3 not protected with suction ventilation. You will note from the attached correspondence that they have now installed a fan and are getting somewhat worried about 'the job. You will note from ny reply that I have been rash enough to express opinions on the hazards of this operation. The correspondence is forwarded for your information and I do not expect a reply unless you feel that I have made any dangerous suggestions. Yours sincerely. SDH: EEL S.D. Haron