[LB023029], Letter from Samuel Insull to Thomas Alva Edison, October 18th, 1886


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[LB023029], Letter from Samuel Insull to Thomas Alva Edison, October 18th, 1886

Editor's Notes

I have got word from Tate in which he says he has been able to work over a 120 mile circuit with eleven offices condensed. His results have been tolerably satisfactory but the chances are that the Canadian Pacific people will deccide to cut out tow or three of the offices, so as to get better results. Referring to the sounder which we use with the relay, Tate says, "In regard to those sounders I wish to add that we must have a better instrument. The magnet in the sounder does not develop sufficient strength. It is too short and requires too much battery. If we put on a sufficient number of Callaud cells to get a heavy enough discharge the resistance destroys the effect of the magnetic coil, causing a long vibrating discharge. Mr. Logue, Mr. Tate's Assistant, suggest that there ought to be some means of testing these sounders. The instrument in fact is very crude at the present time. When you get back to the laboratory would mind looking into the matter.




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