William Crookes used this to help to discover cathode rays
A image taken in the same region of light as the Paschen series
This experiment helped to discover the mass to charge of an electron
The spectrum gained when light is absorbed
Put forward a theory for the atom based on the element hydrogen
The spectrum gained when light is emitted through electron movement down levels
George Stoney gave this a name.....
Thomson used this device to determine that cathode rays have a - charge
