[N304105], Technical Note, Thomas Alva Edison, May 12th, 1882


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[N304105], Technical Note, Thomas Alva Edison, May 12th, 1882

Editor's Notes

"Reducing EMF" various schemes, some clear, some not. p. 111 is May 2 "Tried today plate lead on pole plate compressed peroxide lead other pole as secondary battery. Works elegantly. Zinc pole to peroxide." Then "try emf reducing experiment today>' Sketch of dynamo and two motors in series; "worked splendid present Logan Hughes Dyer INsull Fred Dynamo man TAE" p. 115 'I am now trying to make commutator bars of sold amalgam by plating ie depositing the metal electrolytically in the presence of a mercury salt so it will be continuously amalgamated as it is deposited. This will prevent spark & render the constant putting of the Hg on the commutator unnecessary." P. 117 "Make battery by using pole of peroxide copper other pole Iodide copper. Also try lead plate & peroxide lead" etc. P. 191 sketch of experimental apparatus for determining resistance of contact on surfaces at high velocities for commutators;" materials to be tested include lead, cadmium, tin, babbib, german silver, nickel, copper, steel." P. 121 sketch of arrangement for reducing emf by using secondary batts in circuit. p. 123-25 regulating field of force mags automatically. 127 regulating emf by a make/break relay; 129 regulating by motor-driven governor and what may be commutator with variable resistance?



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