Author Topic: Beetle in a Geißler tube  (Read 1856 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 :)

Offline shrad

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Re: Beetle in a Geißler tube
« Reply #6 on: October 22, 2019, 02:51:27 PM »
I have a couple Y2K commemorative lamps with the same kind of fluorescing material with E27 sockets... sad they are not the other form ones like this beetle, but they are nice too

I'll try to make a picture when I have the opportunity to put one out of their box...

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Re: Beetle in a Geißler tube
« Reply #6 on: October 22, 2019, 02:51:27 PM »

 


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