[LM111376], Letter from Arthur Edwin Kennelly to Samuel Insull, April 9th, 1889
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Title
[LM111376], Letter from Arthur Edwin Kennelly to Samuel Insull, April 9th, 1889
Editor's Notes
####[page 182]####9th April 1889####Samuel Insull Esq####Dear Sir####I beg to report as follows upon the sample of noninflammable wire and insulating substance tested during the last 24 hours.####Wire samples####No 1 0.016" copper wire covered to 0.20" braided dark red black labelled silicate of soda graded#### - 2 0.016" cooper wire covered to 0.20 braided red and yellow labelled grade 1 non inflammable####- 3 0.086" copper wires covered to 0.20 braided red and yellow labelled grade 2 1 ----- rubber non inflammable####- 4 double wire --- strand 12 of 0.00-6" copper ------ covered, ----- with red & black marked flexible cord non inflammable####- 5 double wire each st----d 114 of 0.0044' copper rubber covered served- with steel wire & braided green yellow. Marked steel covered flexible cord.####All of these samples were tested for inflammability with the Bunsen burner flame. All of them when ignited in this flame rapidly extinguished in air and were practically non inflammable.####Soaking for five minutes in fresh water did not appreciably injure the insulation of any of them.####Passing a strong current through them so as to melt, then, no 1 melted without burstting into --- ---####there all burst into flames ---- melting####Testing for 20 hours on boilier plates - - --- --- -- - -- - did not visibly affect them.####The sample of hard material as a substitute for hard rubber was ---ted for mechanical and chemical properties.####It density was 1.39--hard rubber 1.15 Its transverse breaking strain is 14% less than that of hard rubber and it is leses elastic, bending less before fracture.####It is not appreciably soluble in solutions of ammonia or acetic acid.####It is much [softer?] in the lathe than rubber and breaks off in powder rather than in chips.####Its insulation does not seem to be quite in high as that of rubber but practically perfect.####Its surface does not seem to resist moisture so perfectly as that of hard rubber.####20 hours of resting upon a very hot plate of steel over 180 [degree symbol] C warped this material and a shut of rubber equally thick, to about the same extent.####It seems therefore to be very satisfactory in every way.####I am sir####Yours faithfully####A.E. Kennelly####
Author
Recipient
Date
1889-04-09
Type
Folder/Volume ID
LM111-F
Microfilm ID
109:288
Document ID
LM111376
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University