File:US22531 David E. Hughes Patent.pdf

Summary

Be it known that I, David E. Hughes, of New York, county of New York, and State of New York, have invented certain new and useful Improvements in Telegraphing; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being made to the annexed drawing, making a part of this specification, which is fully referred to by letters-that is to say my invention consists in certain improvements in that class of electric-telegraph apparatus whereby messages may be transmitted from both ends of a line over a single wire at the same time without interference. In the present plan of operation employ the system of natural magnets and electro-magnets as patented to me on the 20th of May, 1856, although I do not wish to be limited to the mode or mechanism therein set forth, as my invention is also applicable to other systems.