How did Joseph henrys telegraph work?

Joseph Henry's telegraph operated on the principle of electromagnetic induction. When an electric current passed through a coil of wire, it created a magnetic field that could induce a current in a nearby coil, allowing signals to be transmitted over a distance without direct electrical connection. Henry's work laid the foundation for later developments in telegraphy by demonstrating the potential of electromagnetism for communication. His experiments contributed to the understanding of how electrical signals could be used to convey information efficiently.