circa 1950: Sir William Lawrence Bragg (1890 - 1971), director of The Royal Institution, demonstrating electrical effects, by turning a generator handle?. (Photo by Hulton Archive/Getty Images)
circa 1950: Sir William Lawrence Bragg (1890 - 1971), director of The Royal Institution, demonstrating electrical effects, by turning a generator handle?. (Photo by Hulton Archive/Getty Images)