[LM111218], Letter from Arthur Edwin Kennelly to Thomas Alva Edison, December 17th, 1888


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[LM111218], Letter from Arthur Edwin Kennelly to Thomas Alva Edison, December 17th, 1888

Editor's Notes

"I beg to submit the following statements to your notice on the performances of the [Leaden?] Primary Battery lately tested at your laboratory.####The cell was brought to the laboratory by the inventors on the afternoon of the 12th December. It consists of two sets of leaden plates sliding into each other in such a way that the whole presents the appearance of a seconday cell. Thus two sets of plates were charged by immersiosn in special chemical liquids during the night.####On the morning of the 13th the cell was set up and recommenced work on half [an?] ohms so as to give at the outset about four amperes, four to five amperes being the current desired by the invention. The EMF at starting was 1.94 volts the internatl resistance about four thousandths of an ohm. In four hours it was quite exhausted the EMF being the 0.33 volts and the internal resistance nearly one quarter of an ohn. The curves of observation is appended herewith. The results showed a total delivery of about 10 ampere hours and a total amount of work done equal to sixty in thousand joules.####A second test at a lower rate of current was made on the 11th after recharging the cell by chemical immersion. The initial EMF was 1.92 volts and the initial internal resistance six thousandths of an ohm--while the starting current was nearly####[pate 117]####two amperes. After 7 hours the call was almost exhausted the EMF being 0.63 volts the internal resistance three quarters of an ohm and the current 0.386 amperes. The total output on this occasion amounted to 9000 joules at some 9 ampere hours. The battery however was not so completely exhausted on this as on the previous occasion. The curve of observation giving EMF current --- and energy is appended.####The result of both tests may then be taken as 10 ampere hours The energy bein obtained chemically. A secondary cells of about the same dimensions would have a capacity of 150 ampere hours charged from a dynamo primary cell his in the comparison of the cost of labour with charging an ordinary secondary cells ---- from a dynamos--together with such advantages or disadvantages as might be discovered after prolonged usage.####Upon these points I am of course not in a position to inform you.####I am Sir####Yours faithfully####A.E. Kennelly####




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