[D8822AAQ], Letter from J H Kuehling to Thomas Alva Edison, April 20th, 1888


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[D8822AAQ], Letter from J H Kuehling to Thomas Alva Edison, April 20th, 1888

Editor's Notes

"I have thought some time to write to you about one matter if not too much trouble for you to answer I have put up electric bells the first 17 years have been a mechanic since my boyhood and try + do everything as current for as possible [unclear] I have [unclear] plenty to do. ### My question is in reference to insulation some make it out safer to put up a lightning rod without insulation in my 25 years experience I have had a number of rods struck + no damage as [unclear] as seen some but up before my day that were struck + the [unclear] passed off safety but in four cases close by one a .5 inch surface upper rod + one iron and a galvanized iron cable the other part copper all not insulated and were struck and damaged both the houses + in 2 cases injured the inmates. I follow up all strikes closely + in no case have I found damage where a copper rod was insulated. ### IN one case the Lightning passed all the insulation above the 3rd one from the ground which was gone + went into the house from the rod at that point. I put the rods from 5 to 12 feet in the ground. What is your opinion in reference to insulation is it bent to do as I have done I {rest of letter is written in margins and is unclear] [Marginalia: "I believe in copper in sheet [unclear] to gave surface as well as conductivity + insulate the same + make a good ground"]





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