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4hv.org :: Forums :: High Voltage
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Butterfly in a Geissler tube

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Physikfan
Thu Nov 10 2016, 10:33PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
The two pictures show a butterfly in a Geissler tube (DC source):

Schmetterling1300x442

Schmetterling2300x249
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Proud Mary
Tue Nov 22 2016, 10:57PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Rather special! smile
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Physikfan
Wed Nov 23 2016, 12:18PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Proud Mary

The pictures show the butterfly in a geissler tube in daylight.

Schmetterling3400x250
Schmetterling4400x235
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ScottH
Mon Jan 16 2017, 05:03PM
ScottH Registered Member #61373 Joined: Sat Dec 17 2016, 01:45PM
Location: San Antonio, TX
Posts: 87
That is beautiful.
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Physikfan
Mon Jan 16 2017, 09:27PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Proud Mary and ScottH

The pictures show the butterfly in this Geissler tube in UV light.

P11904541400x445
ASA400, exposure time 1/20 s.

P11904571400x536
ASA400, exposure time 1/40 s.

Note the different colors for the two different exposure times.
At the lower exposure time the glass fluorescence is also almost invisible.
On the upper left is the UV lamp reflex, which looks with the naked eye really violet and not light blue as seen in the picture.

With the naked eye the reflex of the UV lamp looks really violet and not light blue as seen in the picture.



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