English: Original caption: "WILLIAM H. ECCLES: Demonstrating at a lecture at the Imperial College of Science in London a circuit on which he has spent much time, which is to bring about a new method of wireless communication. The sending apparatus produces easily recognizable musical chords at the receiving station. The most common chords would be assigned to the vowel sounds. Dr. Eccles is Professor of Applied Physics and Electrical Engineering at the London Technical College and a well-known authority on radio."