[D8752AAN], Letter from B Johnson to Thomas Alva Edison, November 5th, 1887


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[D8752AAN], Letter from B Johnson to Thomas Alva Edison, November 5th, 1887

Editor's Notes

On the stationary of the "Treasury Department, Office of the Light-House Board." "On 11 Aug. '87, I read a paper before the American Association for the Advancement of Science, on the Difficulty of Determining the Direction of the Source of Sound of Fog-Signals at Sea, and I concluded it by enumerating the various methods complete and in progress, which had been devised for overcoming those difficulties. Chief among these I spoke of the experiments which the press said you were making as to a method of communication between vessels at sea, and between ship and shore. ## My paper has been accepted for publication by one of our Scientific Monthlies, and I am bringing up to date my statement of progress made in the several above mentioned devices. I have no knowledge of yours further than was given in the papers whil you were in Florida. I should be glad, in justice to yourself and of course to add interest to my paper, to say more of your device, if you think proper. ## I, therefore, take the liberty to enclose an envelope for anything you may be pleased to send me on the subject. ## And in this connection, I send you two of my pamphlets on cognate subjects. in a separate pkge"







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