[D8805AAP], Letter from J H Farnham, New England Telephone and Telegraph Co to Thomas Alva Edison, February 6th, 1888

Item

Abstract

"In the Electrical World (New York) of Jan. 1, 1887, is printed an extended article on "The Effect of Electro Magnets in Telephone Circuits," in which it is claimed that connecting the two coils current is 'neutralized' in itself. In the same paper of Jan. 29, 1887, I attempted to show that the connecting in 'multiple' has no practical effect only so far as it reduces the energy of the magnet and that a magnet wound with a wire double the size (electrically) and half the length would accomplish practically the same result and in a more simple and inexpensive manner. ### Also in the 'World' of May 21, I explained a further experiment to maintain my position. ### Am aware that my views differ, not only with the writer of the first article referred to, but also with such eminent authority as W.H. Preece, F.R.S. (see his book 'Telegraphy') I account for it on the ground that Mr. Preece did not give the matter much study. It occurs to me that the question in both a scientific and practical point of view may be sufficient to attract your passing attention. ### I shall regard it a great honor to receive your views on the disputed point." Very respectfully, J.H. Farnham Electrician [TAE marg: "Connecting two magnets or two legs of one magnet gives the same inductive effects as with a single one using one inducting effects on the line from magnets [unclear] got rid of in this manner and any multiple [unclear] with one side must be non-inductive")

Date

1888-02-06

Decade

1880-1889

Type

Identifier

D8805AAP

Folder Set

D8805

Title

[D8805AAP], Letter from J H Farnham, New England Telephone and Telegraph Co to Thomas Alva Edison, February 6th, 1888

Microfilm ID

121:209

Publisher

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