In article , Leo
writes:

Agreed - but at a sweep of 1.2 seconds, the phosphor would need to
have a pretty long persistance to make a nice even display like the
one pictured.......bright, too!

Long exposure on the camera, that's all. I once did an 8 hour time exposure...

My Tek 465 can't do that - where can I buy one of those?

P7 in an old Dumont will do the job.

Of course it's probably just photoshopped. Like what they did to Google on
fark.com

73 de Jim, N2EY