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Cathode Ray Oscilloscope
Y plates
Electron gun
X plates
Vacuum
Screen
Electron gun Switch on
6.3 Volts A.C.
1 000 Volts D.C.
Electron gun
Thermionic emission
6.3 V AC
Switch on 1 000 Volts D.C.
Electron gun
6.3 V AC
1 000 Volts D.C.
Y plates
Electron gun
X plates
Y plates
X plates
Connect X plates to a cell and switch
Y plates
Turn on
X plates
Y plates
Reverse cell
X plates
Y plates
X plates
Connect Y plates to a cell instead
Y plates
X plates
Connect other way round
Y plates
Both together
X plates