[D8935AAV], Letter from William J Jenks to Thomas Alva Edison, May 3rd, 1889


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[D8935AAV], Letter from William J Jenks to Thomas Alva Edison, May 3rd, 1889

Editor's Notes

[TAE marg: Kennelly do it & put in time to Tate--E] Dear Sir-- I enclose copy of a letter sent to Mr. Johnson April 20th, to which he replied April 22nd--This correspondence will I think explain with sufficient clearness what Mr. Kennelly evidently thoroughly understands, that is the desire of the Light Company to obtain data as to the safe-carrying capacity of copper Conductors of 97% conductivity, together with other figures representing say 90% conductivity which may be incidently derived.##Please have Mr. Kennelly make for the Light Company such tests as are necessary to settle here questions.##Very Truly yours, W.J Jenks, Director, S.##[Enlosure]: April 26th, 1889##Mr. Johnson--This matter of the safe carrying capacity of wires of different sizes is well worthy of an investigation in the light of what Mr. Kennelly says. The tables thus far issued by the Light Company show the carrying capacity at a certain specified temperature and not the safe limit with a rise in ttemperature of a given number of degrees above that of the surrounding air.####You will notice that Mr. Vail is also desirous to complete the collection of whatever information we can secure on this subject.####It is particularly important that a table be made showing these figures with 97% conductivity of copper, and that in our futuire work arrangements should be made with the companies producing wire so that samples of their copper can be tested by us from time to time to determine whether we are treading on safe ground.####Do you authorize a repeat to Mr. Edison on the part of the Light Company?####Yours Very Truly, W.J Jenks####W.J Jenks: YES, E.H Johnson, Pres't####[name mentions: W.J Jenks, Edison Light Co., A.O Tate, A.E Kennelly, Thos Edison, E.H Johnson, Mr. Vail]




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