"The Telephone" (patent)

"The Telephone" patent, filed by Alexander Graham Bell in 1876, outlines a device that transmits sound over wires by converting sound waves into electrical signals and back into sound at the receiving end. It uses a sensitive diaphragm connected to an electromagnetic mechanism to modulate electrical current with voice vibrations. This electrical signal travels through wires to reach the other device, which then reproduces the sound. Bell's invention marked the first practical method for real-time voice communication over distances, laying the groundwork for modern telephony.