[NM023094A], Technical Note, Arthur Edwin Kennelly, April 8th, 1889
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Title
[NM023094A], Technical Note, Arthur Edwin Kennelly, April 8th, 1889
Editor's Notes
Hard Rubber Substittute Test April 8th 1889##The following tests were made of a sample of black substance intended as a substitute for rubber. Its thickness was 3/8" A sheet of hard rubber 3/8" thick was selected for comparison. A strip was cut from each sheet, the dimension being 15 cm x 1.35 x 0.78. In cutting the new material that smelled like ebony hasd a granular structure and cut off in powder was much softer than the rubber. On taking these strips planed equal and fixing them across blocks of steel, the breaking strain in the center was found to be about 100 lbs for the ne material and 115 lbs for rubber which bent much more before fracture.##The spec. gravity of the real hard rubber was 1.18##[dittos] substitute [dittos] 1.38##The weight of two pieces of the substitute were 11.09 and 10.78 respectively. After immersion for tow hours in a solution of NH4HO and acetic acid the weight was 11.22 and 10.78. [following this undated is a listing of the weight of parts of the Octopolar Dynamo with an estimate of the total weight of the machine]
Author
Date
1889-04-08
Type
Folder/Volume ID
NM023-F
Microfilm ID
104:350
Document ID
NM023094A
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University