[NM023098], Technical Note, Arthur Edwin Kennelly, April 8th, 1889

Item

Abstract

Test of certain specimens of non-inflammable wire##Received from Mr Insull for testing 5 specifmens of wire as follows##[in list form]#1 No. 14 copper wire 0.086" covered to 0.20" dark red & black braid marked silicate of soda grade 1 #2 No. 14 copper wire 0.086" covered to 0.20" red & yellow brade marked grade 1 non inflammable #3 No. 14 coper wire 0.086" covered to 0.20" red & yellow brade marked grade 2 1 coating rubber non inflammable #4 2 strands each 12 #32 BEG 0.0085" copper rubber covered, and coated with red and black braid marked flexible cord non inflammable #5 2 strands each 14 0.0055" copper rubber covered and helically coated with steel wire greed and yellow brade marked flexible cord covered with steel wire##Specimens of all these samples were tested with bunsen flame and found to be practically non inflammable since any flame set up was soon extinguished on isolation.##Soaking for 5 mins in water was not found to impair the insulation of any specimens.##On forcing a current through other specimens to the metling point the behavior was as follows [in list form] #1 Melted without catching fire #2 burst into flame on melting at two points #3 [ditto] #4 [ditto] #5 [ditto]##The current used for the 1st three was about 150 amperes and for the last two about 50.##[Followed on page by] Data concerning Octopolar Dynamo resistance [ddata in list form] 152 Commutator Blocks 456 Turns of No 10 wire 5.75 x 10-4 per ft/20 each 1.7 ft 8 complete batteries = 57 turns per battery 57 x 1.7 x 5.75 x 10-4/8 = 69.7 x 10-4 = .00697 add to this about 7" equivalent of #12 wire .0005 Total .0075w. 1 to 20 when est res .50 - wire+1300 lamps @ 200w each = 860 amperes.## Assumin that the heat from the foucaut currents could be reduced 50% the temperature rise would if there were no convection be also only 50% but with convection into account it would be more say 70%

Mentions

Date

1889-04-08

Decade

1880-1889

Identifier

NM023098

Folder Set

NM023

Title

[NM023098], Technical Note, Arthur Edwin Kennelly, April 8th, 1889

Microfilm ID

104:354

Publisher

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