![File:J J Thomsons cathode ray tube with magnet coils, 1897. (9663807404).jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/J_J_Thomsons_cathode_ray_tube_with_magnet_coils%2C_1897._%289663807404%29.jpg/800px-J_J_Thomsons_cathode_ray_tube_with_magnet_coils%2C_1897._%289663807404%29.jpg)
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