[D8846AAA], Letter from Dyer and Seely to Thomas Alva Edison, January 11th, 1888


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[D8846AAA], Letter from Dyer and Seely to Thomas Alva Edison, January 11th, 1888

Editor's Notes

Case 605 on using ampere meters in a distribution system finally rejected; must do something soon about this. Two pages of TAE marg: The putting in these amperemeters was the result of long experiment in the early days. We found on putting several dynamos in multiple arc that some wold run cold & others hot. That the shifting of brushes varions of speed etc produced very irregular & constantly varying results, so that it became a very serious question at one time if a great many large machines could be worked in multiple arc. We were not aware then that if 2 machines were in multiple arc & one was 100 volts & the other should by a difference in construction but running at same speed be run as a motor when only 4 or 5 voles less hence we found by experiment that the only was was to put in ampermeters & balance load by these as voltmeters couldn't be used.....## I maintain there is a considerable amount of invention in several Dynamos in multiple arc provided with means for m aking each carrying its proper load & means to indicate how to do it. Its not the mere use of a ampermeter. If the examiner had been with me in the early starting of the NYork station he would [drop?] very quickly that there was a pile of experiment if there wasn't any invention. **** Faraday's reference is a continuous copper wheel with spring rubbing on it amalgamated. Our device is one where there are sparks & the mercury not only does what it did with Faraday but servefs another & very important ie. the Spark heat is carried off by the mercury vapor.......






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