[NM023108], Technical Note, Arthur Edwin Kennelly, May 15th, 1889


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[NM023108], Technical Note, Arthur Edwin Kennelly, May 15th, 1889

Editor's Notes

Arc Light Experiment. One large carbon was drilled out to be held within it a smaller concentrically The two fitted into a cylindrial shaft cut through the core of an electromagnet. This latter was fixed but the carbons could be spun on their vertical axis by means of a separate wheel and pulley. On passing the current throught he electromagnet and so into the carbons bridged for contact, an arc was set up which rotated itself against the direction of the corrent in the magnet. This was accounted for by Amperes law. If the electromanget were left out of circuit then the arc turned at one speot and this spot did not shift on rotating the carbon, nor was easy to cause its shifting by means of a separate electromagnet. To find the coiling space required for 45w and also for 30w of No 35 BWG copper wire having 2.422 feet per ohm = 108.9 feet for 45w and 72.6 feet. [drawing of appratus on left page]




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