Cathode rays and deflecting fields can be used to magnify shadow images in a manner analogous to an optical lens system.
With the help of this supplement, the experiment: Maltese-Cross Tube (item no: UE3070300-115 / 8000659 is modified in such a way that the following electron-optical observations can be made:
By increasing the magnetic field (raising the voltage to the coil) the image is seen to rotate, diminish to a spot and then enlarge again in inverted form.
Anode voltage variations provide a further element of control.
![Experiment: Maltese-Cross Tube, Supplement (115 V, 50/60 Hz), 8000661 [UE3070300S-115], Electron tubes](/imagelibrary/UE3070300S-115/UE3070300S-115_01_Experiment-Maltese-Cross-Tube-Supplement-115-V-5060-Hz.jpg)
![Experiment: Maltese-Cross Tube, Supplement (115 V, 50/60 Hz), 8000661 [UE3070300S-115], Electron tubes](/thumblibrary/UE3070300S-115/UE3070300S-115_01_1200_1200_Experiment-Maltese-Cross-Tube-Supplement-115-V-5060-Hz.jpg)
![Experiment: Maltese-Cross Tube, Basic equipment (115 V, 50/60 Hz), 8000659 [UE3070300-115], Electron tubes](/thumblibrary/UE3070300-115/UE3070300-115_01_140_140_Experiment-Maltese-Cross-Tube-Basic-equipment-115-V-5060-Hz.jpg)