The telegraph in American and Morse memorial (1886)
Reid, James D · New York, Printed for the author by J. Polhemus · leaf 922
. D. Munroe, J. Wyman Jones, C T. Polhamus. E. V.Clark. The instrument used by the ManhattanQuotation Telegraph Company owed itseffectiveness to a device which seemsidentical with the patent granted toPope and Edison, April, 1870, and toVan Hoevenberghs improvement on thePhelps. The accompanying… … ■^t-^ 4 844 American Telegraphic History. A, is a permanent magnet highly sensitive to changes of current. Thepress magnet P is similar to an ordinary sounder and its office is, asits name applies, to impress, when brought into action, an interveningstrip of paper against the type which has been…
Morse, Samuel Finley Breese, 1791-1872 · Telegraph
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