Author Topic: Beetle in a Geißler tube  (Read 212 times)

Offline Physikfan

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Beetle in a Geißler tube
« on: November 06, 2017, 08:52:00 PM »
The two pictures show a beetle in a Geißler tube:
(DC source, 9 kV, cathode top, anode bottom)



Exposure normal, with room lighting, fluorescence on the glass wall


Exposure 2 f-stops underexposed, room dark, fluorescence on the glass wall


Exposure 2 f-stops underexposed, room dark

Offline Mads Barnkob

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Re: Beetle in a Geißler tube
« Reply #1 on: November 07, 2017, 10:22:25 AM »
Interesting colours on the beetle, I know that some insects have patterns and markings that only show under UV, but the big differences between colours on the beetle here surely suggest that it was doped/contaminated with different materials to make it glow in different colours?

It is a sealed tube right? That glass blower actually put that beetle in-there when making the tube or can you open it up and put samples in, evacuate and fill with gas?
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Offline Physikfan

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Re: Beetle in a Geißler tube
« Reply #2 on: November 10, 2017, 08:05:47 AM »
Beetle in daylight without discharge:


Offline Physikfan

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Re: Beetle in a Geißler tube
« Reply #3 on: November 11, 2017, 07:52:55 PM »
Hi Mads Barnkob

"Interesting colours on the beetle, I know that some insects have patterns and markings that only show under UV, but the big differences between colours on the beetle here surely suggest that it was doped/contaminated with different materials to make it glow in different colours?"

The beetle is an artefact, you see the colours of different fluorescent materials.

"It is a sealed tube right?"

Yes, the tube is more than 100 years old.

"can you open it up and put samples in, evacuate and fill with gas?"

No, but I will try to get a tube which can be evacuated and filled with a gas.

Regards

Physikfan

Offline Physikfan

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Re: Beetle in a Geißler tube
« Reply #4 on: November 12, 2017, 04:31:28 PM »
Bottom of the beetle in daylight without discharge:


Offline futurist

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Re: Beetle in a Geißler tube
« Reply #5 on: November 19, 2017, 03:59:26 PM »
I thought it's a real beetle, now it makes much more sense :)

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Re: Beetle in a Geißler tube
« Reply #5 on: November 19, 2017, 03:59:26 PM »

 


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