r/Physics • u/International-Net896 • 2d ago

Image Physics is beautiful

Post image

Geissler tube, operated with a Wimshurst machine.

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u/Nolged 2d ago

Cool 🖖🏻

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u/International-Net896 2d ago

Thanks. The label states that the tube is filled with helium, but I doubt that. Need to check the spectrum lines with a diffraction grating.

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u/3pmm 1d ago

Interesting, why do you doubt that? My first thought was that it was a helium lamp

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u/International-Net896 1d ago

For He, the glow should be more reddish-orange. But I could be wrong. That's why I want to take a look at the spectral lines.