. Bulletin. Science. â "^â ^â¢t !â '- I' " Figure 28.âWheatstone's automatic tel- egraph, a, Top view of tape perforator; b, side view of ta pe perforator; c, receiver; d, diagram of the transmitter tape sensor, which controlled the direction of the current in the telegraph line. From W. H. Preece and J. Sivewright, Teleg- raphy, New York, 1876, pp. 117, 119, Down Line ^ repeat the signal from one 10-mile circuit to the next. He was fortunate in his choice of a confidant, for Gale was familiar with Henry's work on electro- magnets and spent the summer and fall of 1837 modi- fyi
. Bulletin. Science. â "^â ^â¢t !â '- I' " Figure 28.âWheatstone's automatic tel- egraph, a, Top view of tape perforator; b, side view of ta pe perforator; c, receiver; d, diagram of the transmitter tape sensor, which controlled the direction of the current in the telegraph line. From W. H. Preece and J. Sivewright, Teleg- raphy, New York, 1876, pp. 117, 119, Down Line ^ repeat the signal from one 10-mile circuit to the next. He was fortunate in his choice of a confidant, for Gale was familiar with Henry's work on electro- magnets and spent the summer and fall of 1837 modi- fying Morse's electromagnet and battery so that they corresponded with Henry's devices. By Septem- ber 2, 1837, Gale could signal through 1,700 feet of wire; by September 27, through one-half mile of wire; by October 24, through 3)^ miles of wire; and by November 13, through the desired 10 miles of wire. A chance visit to Morse on September 2, 1837, by a young man named Alfred Vail ^* made it possible 28 Franklin L. Pope, "The American Inventors of the Tel- egraph. With Special References to the Services of Alfred Vail," The Century Illustrated Monthly Magazine, April 1888, vol. 13, pp. 924-944; "Invention of the Electro-Magnetic Telegraph," Electrical World, 1895, vol. 26, pp. 71-73, 105- for Morse to submit a proposal for a telegraph to the Government. Vail was fascinated by Morse's instrument and by Morse's idea for a relay to be used in conjunction with it. On September 23, Vail agreed to construct at his own expense a telegraph based upon Morse's design that was to be ready on January 1, 1838. For bearing the cost of patenting the invention, Vail obtained a share in it, thereby joining Gale who also had an interest in it. On Sep- tember 27, 1837, Morse wrote to the Secretary of the Treasury explaining the advantages of his new means of telegraphy, and the following day applied for a caveat that was eranted on October 3, 1837. 108, 129-132, 153-156, 1
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