[D8845AEL], Letter from Walter Seeley Mallory to Edward Galbraith Thomas, October 13th, 1888



"As promised I herewith enclose you the test of the Sampson Ore, which I ran while at Orange. You will notice that I have given you each, without the exhaust, and with the exhaust, and the tests made without the exhaust, seems to show the greater amount of reduction, of phosphorous and sulphur, still I think this can be hardly be correct, as certainly the exhaust ought to show the greater reduction. I think however this is due to the fact, that when we had the exhaust on, you also had the air blast going, and this I think has the effect of stiring up the dust in the confined spaces and forcing some of it over into the concentrate. Let me know, what you think on this point, you know that this ore runs very high in phosphorus, and sulphur, and for that reason, I selected it, to see how much reduction we would make on it, you will notice on the back of the page, other tests of this same ore, which shows some inside of the bessemer limit, and only one test any where as near as high as that of the ore we separated. You will also notice I have analyzed the dust, takenf rom the Sampson Ore, which shows that in this instance 30 percent of the dust is composed of phosphorous, so it would seem to me, that the exhaust, certainly would be an advantage if it took this away from the concentrate. Also notice the test of the cranberry ore which shows up well. I would like to have you show this to Mr. Edison, and to Mr. Dickson. From this test it seems to me, the running the ore once, accomplishes just as much as running it half a dozen times, and that if the phosphorus and sulphur were to be decreased, and the metallic iron increased, that it would be necessary to amek any great change to recrush it again, of course that is not desirable, I would like very much to have you, let me know, what you think of the tests, and how they impress you: while at the Laboratory, you mentioned, that you did not understand why W. Sherman & Co:--did not order one of the separators, when they get such beautiful results from it. When at New haven talking with Mr. Blake, he told me, that they had promised him the contract for building their plant as soon as they were settled in regard to it, and the last time that he saw them, they told him, they had decided to do nothing in regard to it, until the Edison Machine had reduced the phosphorous within the Bessemer limit, and tha tup to that time it had not been accomplished. This may be true, any may be only gossip, but giving to you as I heard it, and it may be of interest for you to know it. Please call Mr. Edisons attention to this also. I leave for the Mill tomorrow, and will write you more fully from there, how things are progressing." With kindest regards, I am. Yours truly. W.S. Mallory "P.S. There is one point, that I would call your attention to in regard to these test, and that is;-- that the concnetrate being larger in proportion of iron, the reduced percentage of phosphorous, between the native ore and the concentrate, but also the percentage of phosphorous is upon the smaller mass of the concentrate, and actually show a larger separation of the phosphorous, than is given by comparison of the percentage." Yours truly, W.S.M.








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[D8845AEL], Letter from Walter Seeley Mallory to Edward Galbraith Thomas, October 13th, 1888

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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University


October 13, 1888

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