Two possibilities for this... First is the time-lapse / persistence of vision type effect already referred to. If the tube is spinning fairly quickly the camera exposure doesn't have to be intentionally manipulated to come up with images like this. See for example a couple of photos I posted here last autumn (https://groups.google.com/g/neonixie-l/c/gMBvFi4fQCw). Those are just what the camera served up on an auto setting, and indeed what the tubes look like to the naked eye.
Second, someone is abusing the tube by simply putting HV across it either without a current limiting resistor or with a fairly low value one that is letting the tube pass say 5-10mA. Most likely the tube is connected with the HV on the anode and then either the first or second guide array grounded, with all other pins left floating. There's a seller on eBay who has a couple of A101 listings with such images, and in those you can see in the background that they've only got two connections to the tube rather than the 4 you would need to actually spin it properly. It's not a great thing to do to the tube, though probably not going to cause any real damage if it's only for a few seconds. Jon. On Sunday, May 9, 2021 at 4:41:25 PM UTC+1 Kevin A. wrote: > Yup my money is on long exposure photography. > > On Sun, May 9, 2021, 11:34 AM gregebert <greg...@hotmail.com> wrote: > >> Most likely a time-lapse exposure with each of the 10 cathodes >> sequentially grounded, and the 2 steering cathodes floating. >> >> Though I've never tried it, you might be able to get multiple parallel >> cathodes to light simultaneously. I doubt they would glow this uniformly, >> but you never know until you try it. Similar for a traditional nixie with >> all cathodes energized, which is a blurry mess. >> >> On Sunday, May 9, 2021 at 8:15:12 AM UTC-7 Phill S wrote: >> >>> I didn't think this was actually possible but then I saw this ? >>> What magic is going on here ? I am at a loss. >>> >>> [image: decatron.jpg] >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to neonixie-l+...@googlegroups.com. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/dcfa8bf9-ef22-4bd4-a24c-4cf18e08cadfn%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/dcfa8bf9-ef22-4bd4-a24c-4cf18e08cadfn%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/0c0b0f5b-04c7-4da7-aa7c-3e461ac0bc01n%40googlegroups.com.
