[D8845AFH], Letter from John Birkinbine to Thomas Alva Edison, November 5th, 1888


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[D8845AFH], Letter from John Birkinbine to Thomas Alva Edison, November 5th, 1888

Editor's Notes

"I went to New York on Friday evening to meet Mr. Frink, who sent you the ore sand from hematite: washing, and had arranged with him to visit the Laboratory on Saturday. We had all the preparations made for doing so, but as he is just recovering from a spell of sickness which confined him to the house for two months we deferred the visit from hour to hour, but the rain did not cease until after two o'clock, it was then so late that I feared we could accomplish nothing. I was anxious to have Mr. Frick visit the Laboratory with me before invent West as he is connected with the large concern of Barnum Richardson & Co. who operate a number of mines in New York and Connecticut. ### I have arranged with the United States Association of Charcoal Iron Workers to visit your Laboratory, either on the 5th or 12th of December, I will let you know definitely which data, and also the number that will be present. ### The chemist who is analyzing the ore which is separated by Buchanan magnetic coils at the Croton Mines in New York State owned by Mr. Cheever, has been examining some of the concentrates under the microscope, he advise me that no matter what size the grain is, it still is a 'molecule' of [unclear] and [unclear] it has places about 1-800 of an inch which consist of magnetite, pyrite quartz, and sometimes honrnblende too: This I consider one of the most difficult of magnetic ores to handle. [Marginalia: "It is what you call 'Cheever Ore'] ### The Annual Meeting of the American Institute of Mining Engineers will be held in New York on the third Tuesday in February (19th) 1889, and will continue probably until Friday of that week, hope to arrange for a session in your Library as you suggested, and present at that time the paper on magnetic iron ore concentration, which can be emphasized by the exhibition of samples, and the apparatus in operation." Yours truly, John Birkinbine




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