[N319015], Technical Note, Thomas Alva Edison, April 8th, 1886


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[N319015], Technical Note, Thomas Alva Edison, April 8th, 1886

Editor's Notes

p. 15 dynamo drawing "Copy Extra coil fixed on outside of armature & at right angles to coil on armature with main current through it having same ampere spirals as armature"; p. 17 drawing "Copy this Two separate and distinct windings on one armature each with separate commutator 50 volts each-- The Two are connected in series at the brushes so the current of one tends to make a magnetism in armature the opposite of the other"; pp. 19-23 rough sketches; p. 25 dynamo drawings labeled "Copy"; p. 27 drawing "Copy Wind armature thus one turn around then before going to commutator another turn round but at right angles & so on winding in regular way-- Thus 1/2 the wire valueless but helps to concentrate the lines of force for the other so the result is the same as only 1/2 wire is used on loaded armature anyway owing to position of brushes"; pp. 29-33 dynamo sketches



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