From 1923, he was Fullerian Professor of Chemistry at the Royal Institution and director of the Davy Faraday Research Laboratory. This institution was practically rebuilt in 1929–30 and, under Bragg's directorship many valuable papers were issued from the laboratory. In 1919, 1923, 1925 and 1931 he was invited to deliver the Royal Institution Christmas Lecture on The World of Sound ; Concerning the Nature of Things, Old Trades and New Knowledge and The Universe of Life respectively.