The Tyndall Medal is a prize from the Institute of Acoustics awarded every two years to a citizen of the UK, preferably under the age of 40, for "achievement and services in the field of acoustics". The prize is named after John Tyndall (1820-1893) who preceded Rayleigh as the Professor of Natural Philosophy at the Royal Institution. He investigated the acoustic properties of the atmosphere and though a distinguished experimental physicist, he is remembered primarily as one of the world’s most brilliant scientific lecturers.