Document ZnGxbQ6z2q4kEj128ZeKr9Xq0

Personal and Confidential May 10, 1938 Dr. George Calingaert Ethyl Gasoline Corporation 725 East Milwaukee Avenue Detro11, Michigan Dear Cal:-* Thanks for your letter of April 2$nd and for the information which you have carefully outlined in it. Proceeding to your last question, I think your calculations are sufficient to provide a proper basis for our selection of a material for our experimentation without benefit of actual ex perimental determinations. In confirmation of our telephone conversation of last week, this is to let you know that in my opinion it is advisable to use a material that will allow us to anticipate some factor of safety in connection with the use of a new compound. With this idea in mind, I think we should take neither the worst nor the best of the compounds from the point of view of hazards anticipated on the basis of vapor pressures. I believe that lead mix N0.IT-50I would provide us with a satisfactory material. I do not mind putting on paper my reasons for this choiceif you wish me to do so, but I assure you that this is not the result of a blind choice but is made rather with consideration of a number of important factors. Sincerely yours. RAKsis Robert 'A. Kehoe, M.D.