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4hv.org :: Forums :: High Voltage
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Geissler tube with a contact problem

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Physikfan
Sun Dec 31 2017, 05:32PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Staticbuildup

This tube has two problems:

1. One contact has no cap
2. The other contact has no electrode inside
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Physikfan
Sun Dec 31 2017, 06:12PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi StaticBuildup, Sulaiman, radiotech, klugesmith and Conundrum

I have followed your suggestions and have provisionally treated the electrode without cap with conductive silver.
The tube is working, the operating voltage is about 13 kV.

P1050112400x191

Best regards

Physikfan
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StaticBuildup
Tue Jan 02 2018, 12:02AM
StaticBuildup Registered Member #61695 Joined: Sun Jul 16 2017, 11:22PM
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Posts: 31
Awesome. shades

That is the first white one I have seen, they are usually purple or blue. I wonder what gas produces white light?
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Physikfan
Tue Jan 02 2018, 09:08AM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
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Posts: 304
I will try a spectral investigation with a grating and my digital camera.
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Physikfan
Wed Jan 03 2018, 09:57PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
In a catalog for physical demonstration devices from 1909 I found one
similar Geissler tube:

IMG 3899400x611
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Physikfan
Sun Jan 07 2018, 12:24AM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
These are the first, just with reflection grating and camera primitively recorded grating spectra of the Geissler tube:

 MG 0152T2400x132
 MG 0150T2400x127
 MG 0151T2400x113

The second green line of the first spectrum is also in the second spectrum as the middle line and in the third spectrum
included as the leftmost line.

The question is now:
Which gas coresponds to these spectra.

Best regards

Physikfan
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Physikfan
Sun Jan 07 2018, 08:50AM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
This is the assembled grating spectrum from spectrum1 and spectrum3.
However, the colors are strongly distorted by the camera's automatic white balance.

 MG 0152151KlebenFarbeenhormiert800x203

The question is still:
Which gas corresponds to this spectrum?

Best regards

Physikfan
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johnf
Mon Jan 08 2018, 06:29PM
johnf Registered Member #230 Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
My guess is the tube is gassy. Nitrogen oxygen plasma is a bluey white while the red line comes from the water vapour = hydrogen
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StaticBuildup
Tue Jan 09 2018, 12:00AM
StaticBuildup Registered Member #61695 Joined: Sun Jul 16 2017, 11:22PM
Location:
Posts: 31
Possibly argon?
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radiotech
Tue Jan 09 2018, 11:32AM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
A grating scope spectra of a fluorescent lamp has a green line. When the tube was pumped,
maybe a mercury diffusion pump was used, A tiny bit got in ?
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