David Hendy explores the early recording technology that captured voices of Florence Nightingale and Robert Browning.
Sounds were ephemeral until recording technology made it possible to capture them.
Professor David Hendy of the University of Sussex introduces bottled moments from the past, including the voices of Robert Browning and Florence Nightingale and 9/11 answerphone messages.
30-part series made in collaboration with the British Library Sound Archive.
Signature tune composed by Joe Acheson.
Producer: Matt Thompson
A Rockethouse production for BBC Radio 4.