[D8830ABT], Letter from Edward Hibberd Johnson to Thomas Alva Edison, August 20th, 1888


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[D8830ABT], Letter from Edward Hibberd Johnson to Thomas Alva Edison, August 20th, 1888

Editor's Notes

"Mr. Jenks says there are several quantities about the chemical Meter not determined with that certainty which we could wish. Among them are- ### Effect of temperature, ### Effect of time, ### Effect of oxidation, ### Effect of very large currents ### Effect of very small currents, ### Effect of using the negative plate of this month for the positive plate o next month. ### There is not only a wide difference of opinion on these points among practical men, but it is claimed by the best metermen that large variations in bills are directly traceable to them. The meter is coming to be necessary in the smaller stations, as well as the largest now building. ### Will you in connection with the work Mr. Kennelly is now doing in this direction, have him give us all the light he can afford us on these and other points which may occur to you, and authorize him to give us in writing for future reference somethings he has by your permission to Mr. Wirt. ### Where it is necessary, please have such experiments made as may settle these vexed questions as far as possible." approve of this only upon condition of your confirming the statement made [unclear] importance + necessity."




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