 By 1931 a valve amplifier and thyratron-based automatic counting system were in regular use in the Cavendish Laboratory.Wynn-Williams' amplifier played an important part in James Chadwick's discovery of the neutron in 1932, and in numerous other experiments.In 1932 Wynn-Williams published details of his thyratron-based scale-of-two counter, which allowed particles to be counted at much higher rates than previously.