[D8801ABB], Letter from Derick H Fitch to Thomas Alva Edison, September 21st, 1888


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[D8801ABB], Letter from Derick H Fitch to Thomas Alva Edison, September 21st, 1888

Editor's Notes

"Your ck. Of the 18th came duly and the same has been placed to your credit in full with thanks. Enclosed find receipt. Now that you see some merit in my "Perfect Battery" and have reported so favorably on its performance, I can suggest another, of a class for which I presume you have considerable use. A cell of constant E.M.L. every way superior to Latimer Clocks. An E.M.F. nearer one volt, and as absolutely fixed and constant as his under the same conditions and use, a constant internalresistance of about half an Ohm. In addition to its usefulness as a constnat measure of E.M.F. it is a clean[?] convenient and powerful cell for many laboratory purposes. It will maintain current up to one Ampere with very little fall of E.M.F., and after so [unclear] the E.M.F. will instantly rise to accurate maxiumum when the circuit is broken. It can be replenished to compensate for consumption, on heavy work as easily the gravity battery, without taking it apart, or breaking the circuit on any work it may be doing. ### The cell is a Mechanical Modification of that described in my U.S. Patent of Sept 16th 1879, and the materials and chemical action the same as those therein claimed. Hence not a "new" thing." Respty D.H. Fitch




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