When performing the experiment the screen shows the following:
When the acceleration voltage is enabled, the electron-shadow of the cross matches with the shadow aof the cross caused by the light of the hot cathode.
Rising the acceleration voltage Va does not effect form and size of the shadow.
Rising the acceleration voltage Va makes the luominicent screen shine brighter.
Rising the acceleration voltage Va makes the impinge area of the electrons a bit smaller (not the shadow of the cross!).
Evaluation:
Electrons propagate in straight lines when there is no electric or magnetic field.
Electrons do not get defelected when passing the Maltese cross.