[D8343R], Letter from William Symes Andrews to Thomas Alva Edison, August 6th, 1883


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[D8343R], Letter from William Symes Andrews to Thomas Alva Edison, August 6th, 1883

Editor's Notes

TAE Central Station Construction Dept New York # Enclosed with the letter is my latest plna for connecting a third dynoma so that it may work as a supple mintary to A or B ot take the place of either in the case of a breakdown# This plan of connecting cancels all former one in there exiisted a savage bug # in the last plan Insul Dynamo A was to supply the current to the field of spare dynamo where the latter was working in conjunstion with Dynaom B or taking the place of Dynaom B breaking dwn and on the other hand Dynamo B was made to supply current to the fieids of space in case of A's Breakign down or requiring help. This is set up frot he purpose of Band of Resistance is used with both dynaoms running in muttiple arc is made purposeless when one the dynaoms has field changes by another independent dynaom havinfa differenct E.M.F. # in running a dynamo in a three wire system where a spare wire is used I it is obviousthat each machine must supply it sown field and in order to the spare one on either side there must be a double main switch arranged accoridng to sketch. # The spare dynamo will always change its own field in the same direction when the plug of the resistance boxes resistance… Goes on to expalin process # please do not let Bergmann forget to express at once the two pressure indicators which he did not give to Insull.





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