Document ppqxjGjXzZg6OvGZE49v82p5X

ccj Dr. G. Edgar Dr. R. A. Kehoe Et hyl Gaso l ine Co r po r at io n Chemic al Resear c h Labo r at o r y 1600 We st Eig ht Mil e Road Dr. Willard Machle College of Medicine Eden Avenue University of Cincinnati Cincinnati, Ohio Det r o it , Michiga n June 13, 1941 .. ; ', Dear Bill: I read with great interest the report on your test of the Army Field Range M-1937. Your method of testing is certainly first class, and your results are quite illuminating. I amat a loss to understand why we never recovered more than lQfa of the lead in this laboratory. I doubt whether individual stoves could vary that much, and if they did, it certainly would be a matter of great concern to us. If the large discrepancy is due to loss during the analysis, the only place where this can occur and account for such a large amount, is the filter disc. The analysis of the disc is a painstaking- opera tion because of the dense structure and chemical inertness of the disc. We did, however, steep it in hot nitric for days and days, and felt pretty confident that we had effected substantially quantitative re covery. I would appreciate, for future use, your sending us a quite detailed description of your procedure, including the appearance, state of subdivision, etc., of the disc during the analysis. ^ .. The method of testing for volatile lead in the unburned vapor ized fuel between the filter and the jets is quite informative and should probably be used in all further tests. Nowthat your tests have definitely established the present normal operating characteristics of the unit, I wonder whether some more work is not in order. Insufficient heat on the generator tube during the first 30 minutes of operation seems to be the main, if not the only trouble. Tie might experiment with either or both keeping the tube longer than 2 minutes in the actual flame during the starting up period, and de signing a bigger and better tube to insure more efficient heating of the fuel to the cracking temperature of TEL. We might do seme of that work in this laboratory, following it up mostly by tests for TELin the unburned fuel. If and when we think we have achieved some improvement, we might pass the information on to you for final testing in your own set up. Another point, which might be investigated, but which can possibly wait until we can make suggestions for improvements, is the behavior of the unit under conditions differing from those stipulated in the instruc tions. The most obvious one there would be what happens if the filter KE 0009493 C l hiJ Dr. W. Maohle age 2 -13-41 should be left in the unit over extended periods beyond the specified 4 hours. ' I ama little disappointed at the analytical results on the blended fuel, and I amsorry that you did not bring this to my atten tion at an earlier date. I see no reason at all why duplicate samples of gasoline should analyze as far apart as 2.86 and 3.15 ml. TEL/gal. In control -work we hope to get as close as 0.02 or 0.01, and we certain ly should be able to get all the results within 0.05 in any case. If and when you do more work along these lines, I suggest that we get to gether and I will have your samples analyzed in my own laboratory instead of in the Gasoline Testing Laboratory. / 0009494