Sir Joseph John "J. J." Thomson (18 December 1856 – 30 August 1940) was a British physicist and Nobel laureate. He is credited with discovering electrons and isotopes, and inventing the mass spectrometer. Thomson was awarded the 1906 Nobel Prize in Physics for the discovery of the electron and for his work on the conduction of electricity in gases.
In The Northland by Tom Thompson, Group of Seven, which included Franklin Carmichael, AJ Casson, LL Fitzgerald, Lawren Harris, Edwin Holgate, AY Jackson, Frank Johnston, Arthur Lismer, JEH Macdonald, Tom Thomson, Frederick Horsman Varley