[D8822AAG], Letter from A D Tingley to Thomas Alva Edison, March 26th, 1888


View document with UniversalViewer   → View document on Archive.org  → Re-use this digital object via a IIIF manifest


[D8822AAG], Letter from A D Tingley to Thomas Alva Edison, March 26th, 1888

Editor's Notes

"I have an acoustic telephone with which I can plainly talk 5 miles with only 20 ft. on each end strained taut--The balance may lay on the ground or under water or be strung on poles and trees and wound around a piece of hardwood each 4 [unclear] and yet it will work all O.K. I am looking for the best insulator against absorbing the pulsation or vibration. Thinking possibly your wide experience may have demonstrated something in this line I presume to ask you the question. ### I have used wooden pins and wound them 1 inch thinck with woolen and cotton felt and they work pretty well. ### If you should happen to know and would kindly tell me your experience if not presuming on my part I remain" [Marginalia: "Never experimented much in that line. Experiment is only way to get at it."]





Folder/Volume ID


Microfilm ID


Document ID



Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Download CSV | JSON