Discharge tubes: aluminium disc cathode and rod anode
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Discharge tubes: aluminium disc cathode and rod anode. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Discharge tubes: aluminium disc cathode and rod anode. Wellcome Collection. Source: Wellcome Collection.