[D8954ADA], Telegram from Magnus Pflaum to Sherburne Blake Eaton, October 5th, 1889


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[D8954ADA], Telegram from Magnus Pflaum to Sherburne Blake Eaton, October 5th, 1889

Editor's Notes

New york, October 5, 1889 Saturday, 3:15 P.M. The following is a telegram I have just received from Mr. Pflaun, S.B. Eaton. "The following are main points of opinion. Unless Patent valid for conductor of Carbon made of fibrous or textile material in arched form cannot be made valid by combining such conductor with the glass hamber hemetically sealed. Arch form of conductor not new Carbon made vegetable or textile material was made before Sawyer and Man used it. Neither Sawyer and Man nor Edison entitled to exclusive use of charcoal. We are fully satisfied that after Edison's invention has been published to the world there was an entire change of base on part of Sawyer and Man and that the application was amended to give it an entirely different direction and purpose from what it had been in its original form. Various changes in application for patent unfavorably commented upon. Testimony of Broadnax shows that the idea of claiming carbons made from fibrous and textile materials was an after-thought. Changes not justifiable and claim cannot be sustained; explanation of delayin applying for patent by Sawyer and Man unsatisfactory. Sawyer and Man were following wrong principle of small resistance and strong current;; Edison acomplished great discovery of high resistance and low current. Opinion then quotes at length from Edison patent two hundred twenty three eight ninety-eight. We are not mistaken in saying that bit for this discovery of Edison attenuated filament in perfect Vacuum electric lighting would never have become a fact, we have supposed it to be the discovery of Edison because he has a patent for it. This may not be the case, it may be the discovery of some other person, but whoever discovered it it is undoubtedly a great discovery in the art of practical lighting by electricity. The opinion concludes with did they, Sawyer and Man succeed in making lamp of commercial value or in finding out the principle on which it could be made. We do not so read the evidence. magnus Plaun




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