[D0001AAB], Letter from William W Morse to William Edgar Gilmore, July 11th, 1900


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[D0001AAB], Letter from William W Morse to William Edgar Gilmore, July 11th, 1900




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


Mr. Gilmore:
I beg to give you report of the comparative test on the following cells July 10th:
3 Edison-Lalande, type "RR", 300 ampere hours
3 Gordon-Burnham, 300 ampere hours
3 Excelsior, 300 ampere hours
3 Nungesser, 600 ampere hours.
Type "RR" Edison-Lalande: All lasted 327 ampere hours, when they exhausted without polarization or anything unusual.
Gordon-Burnham: Two polarized between 6 P. M. (output at this time 245 ampere hours) and 7 A. M. the following day (output at this time 271 ampere hours). The voltage of the third cell at 271 ampere hours dropped to .10.
Excelsior: One cell polarized at 311 ampere hours; one polarized at 271 ampere hours and the third ran to 331 ampere hours, at which time it was exhausted, without polarization, but the voltage dropped to 0.
Nungesser: One cell short-circuited between the zinc and oxide receptacle at 178 ampere hours. The other two polarized at 311 ampere hours. All the Nungesser solutions are a dirty blue or yellow color and the zincs precipitate to the bottom of the cell.
None of the Edison-Lalande cells polarized; on the contrary, all of the other makes either polarized before the time was up or the voltage dropped suddenly, with the single exception of one Excelsior cell, which lasted eight hours longer than any of the type "RR" Edison - Lalande cells and then dropped to 0.
Wm. M. Morse
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