An interesting edition of Word of Mouth on Radio 4 on Monday looked at the history of the microphone. We even got another chance to hear that recording of Au clair de la lune which gave Charlotte Green the giggles on the Today programme two years ago.
John Liffen, Curator of Communications at the Science Museum was one of the contributors, which reminds me to mention the excellent blog Stories from the Stores where staff of the museum share the stories and information emerging from their research.