[D8935ABL1], Letter from Charles Summer Wirt to Charles Batchelor, September 18th, 1889


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[D8935ABL1], Letter from Charles Summer Wirt to Charles Batchelor, September 18th, 1889

Editor's Notes

Edison General Electric Co., Mr. Charles B. Batchelor, Edison Laboratory, Orange N.J, Dear Sir;####In answers to yours of the 16th inst. I would say that my discussion of the motor dynamo was rather illustrative than statistiscal. Still as to the cost of power, I got what information I could from the data of the engineering dept. and from such men as Mr. Beggs, Mr. Edgar, and Wilson Howell, and I meant to take a figure that would be near the average for Edison stations. From the reports of six stations in different parts of the U.S. I got the average cost of COAL only for one electrical HP hour on the station bus, equal to one cent almost exactly. Accepting this result as fair, it remains to add the proper amount for all the other expenses of the station which go to make the cost of the nergy delivered. These vary immensely in different stations. The extreme variation in the output is what brings up the figure so high. I do not pretend that my figure of 4 cents is made up from analysis of statistics. It is not. No two people seem to be agreed as to just what items should be charged against the cost of energy delivered. I considered that for the purpose of the motor dynamo the energy would be alled for principally during the hours of heavy load. It is not a levelling up, of the load line, it is an addition to the height.####Of course in some cases the result would be only a small addition to the cost of operation outside of fuel. However for the purpose I considered it fair to allow that the increased cost would be pro rata to the increased output.####Yours very truly, Charles Wirt####[name mentions: John Beggs, Wilson Stout Howell, Charles Batchelor, Charles Wirt, Mr. Edgar, Edison General Electric Co., West Orange Laboratory]





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