[LB054684], Letter from Thomas Maguire (Edison Employee) to Edison General Electric Co, John Kruesi, December 28th, 1891
https://edisondigital.rutgers.edu/document/LB054684
Transcription
December 28, 1891. John Kreusi, Esq., Gen’l. Manager, Schenectady Works, Edison Gen’l. Electric Company, Schenectady, N. Y. Dear Sir:- We have discovered a way to make vulcanized rubber non-inflammable, which Mr. Edison wishes thoroughly tested with a view to its use in telephone exchanges etc. This is accomplished by soaking the rubber coated ire previously vulcanized in a molten non-inflammable material; the rubber absorbs a large percentage of this material, increasing in bulk and becoming non-inflammable at the same time. In order to test the result we require 200 feet each of the following thicknesses of rubber on #13 B & S copper wire: 1 Sufficient thickness of rubber to bring size of #13 wire up to 118/1000”diam. 2 Sufficient thickness of rubber to bring size of #13 wire up to 123/1000”diam. 3 Sufficient thickness of rubber to bring size of #13 wire up to 153/1000”diam. 4 Sufficient thickness of rubber to bring size of #13 wire up to 158/1000”diam. We will forward to you by express the rubber for these samples. The rubber which you use in making rubber covered cables would not answer for this purpose, as it contains mineral matter which would injure the result. Yours truly, THE EDISON LABORATORY By Thomas Maguire