[D8905AIA], Letter from Henry C Demming to Thomas Alva Edison, November 5th, 1889


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[D8905AIA], Letter from Henry C Demming to Thomas Alva Edison, November 5th, 1889

Editor's Notes

In compliance with the promise made during personal interview on Saturday, I send you..a small quantitiy of the mica referred to. I have cut some of it into the proper size, and split it to the proper thickness fo most effective work. I think…it will answer the purpose of the diaphragm as fully as the crystal glasses of German manufacture. ## By the way, I was engaged…yesterday near the works of the New Jersey and Pennsylvania Concentrating Co., and took advantage of the proximity to visit the works and mines. I was sorry I hadn't all my instruments along for the purpose of locating magnetic iron ore. The prospects of a large quantity there--sufficient to keep you works running for a year--seem very doubtful indeed. I was surprised as well as gratified with the thorough working of the magnetic operator. Do you not have difficulty in disposing of the product, on account of its being so finely ground? Could it not, by being dampened, be pressed into cakes, and thereby be more readily used in the furnace? ## When you visit that locality, it would give me pleasure to join you with the necessary instruments, in order to determine further if there is magnetic iron ore there in quantity. I have determined for others in regard to bodies of ore, and very successfully.




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