- Published in issue 9/1999 on page 19
When electronics was young - part 7
With the passing of the years, developments and inventions in the electrical field succeeded each other in increasing tempo. In 1876, Alexander Graham Bell (1847–1922) developed the telephone. The sound to be transmitted via the telephone line was picked up by a funnel-shaped horn. The horn was terminated by a thin metal diaphragm immediately behind which was a small coil wound on a bar magnet.