Koma Fîzîkê ya Pola 11-ê amûra meya herî dawî - lûleyek tîrêjê ya dualî - bikar tîne da ku barkirina rêjeya girseyê (q/m) elektronan bipîve. Elektron in accelerated to a velocity of up to ten million metres per second, before being bent into a circular path by a magnetic field. By measuring the diameter of the circle and the current in the field coils, q/m can be determined. The path of two electron beams can be seen as orange lines in the tube, caused by the electrons striking neon atoms present at low pressure.
Dibistana Navnetewî 
