Crookes Maltese Cross tube

The cathode rays hit the glass and make it fluoresce green. The shadow of the metal maltese cross glows more vividly than the surrounding glass when the hinged metal cross is flipped down as the fresh non-bombarded glass glows brighter.

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[ivanlagrossemoule]

Had some of them at school. The teacher told us that they had some really beautiful ones a few years ago. But they were ancient (the college where I used to go was centuries old). One day some guys came and found out they were dangerously radioactive so they had to remove them from the school. Now I'm looking for some people on youtube who don't care about their lives and still use them.

[AlastairWright]

@ivanlagrossemoule

It's a shame they were removed from your school. I wonder if the people who removed them sold them as some of these tubes are worth a lot of money. There's a confusion here as the tubes are definitely not radioactive. However some tubes with an extreme high vacuum emit X-rays when powered up and shouldn't be used in schools.

[EpicPilloww]

So the production of a sharp shadow hints at the fact that its a stream of light?

[AlastairWright]

@EpicPilloww a stream of something, electrons in fact.

[AlastairWright]

@KX36

You obviously don't have any idea what is happening in the video.

[oskaras77]

thats iron cross of german army not the maltese cross...

[HorizonDelta]

Kool !

[western582]

@davideoking101 I think initially the light streaming was blocked by the cross and all the light received was due to diffraction and reflection from the glass tube but when the cross was put down,the rays directly reached increasing the intensity of the light!!

Or else simply we can put it as persistence of the fluorescence!!!

[iTechRevolutionTV]

@AlastairWright Here in Belgium , they don't support so much of science. and I love science but in our school there is like 1 or 2 material for 1- 6 grades

[ivanlagrossemoule]

@davideoking101 They use coating that reacts to the electrons to produce light. That coating doesn't last forever and it gets used over time. The coating behind the cross isn't as used and therefore produces more light. If you want more details you would probably have to look up how the coating's chemistry works.

[JRussoBuffaloNY]

Tis' a cross pattee', not a maltese cross.

[Shiboneko]

now it's broken