[D8968AAH1], Report from Arthur Edwin Kennelly, May 1889
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Title
[D8968AAH1], Report from Arthur Edwin Kennelly, May 1889
Editor's Notes
Particulars of the conversion of the present Multipolar continuous dynamo into an alternating machine.####The commutator would be replaced by contact songs.####The radial wires would be suppressed.####The director of the [gramme?] ring winding to be reversed eight times in the circle, alternatly right handed and left handed in each octant.####The whole ring cut at one point or at symmetrical points and brought thence to the collector rings.####If cut at only one point the e.m.f. would be the sum of eight present e.m. forces except that the maximum would correspond to the present average, and the mean would be 63.7% theoretically of the present average, so that if the field magnets were excited to give 140 volts in the present machines it would correspond to about 700 volts mean alternating.####The alternations would be 8 per rev: or at 800 revs per min 107 alternations per second=53 1/2 complete periods####A.E. Kennelly####[name mentions: A.E. Kennelly]####1st There is no known method of practically insulating overhead wires under the present conditions of plant####2nd Putting wire underground in tubes through which the air passes and subject to condensation of moisture and ingress of water, to the dissolving action of coal gas and air oxidation will transfer the deaths to the manhole, the stores and houses####3rd There is only one method whereby all dangers can be eliminated, and I think perhaps under the law of governing policce regulation of municipalities the police could carry it out, and that is to limit the electric pressure and its character down to or below the point of danger to life just as a boiler in New York has to be heated by the police and the pressure valve set before it can be used.####4th The maximum pressure allowable for continuous urrents is in my opinion seven hundred volts two onsecutive blocks of the machine generating the current, and 200 volts pressure for the alternating####[name mentions: A.E. Kennelly]
Supplied year and month
Author
Date
1889-05-00
Type
Subject
Folder/Volume ID
D8968-F
Microfilm ID
128:352
Document ID
D8968AAH1
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University