[photo-3d] alternative 3D slide viewers

[Peter Homer <P.J.Homer@xxxxxxxxxxxxx>]

>...
>>Boris had it on loan at the last NSA conference and seemed to like it, and
>>Boris is a tough audience... The completed viewer uses a cold cathode

I replied before that I was puzzled as to what was meant by a cold cathode light source, because as I understand the term they could be a source of X rays, which does not seem like a good idea for a viewer that is going to be held close to the face. Most of the cold cathode devices I have at work are labelled USE WITH SCREEN probably for this reason althought it may be because of the risk of implosion. In fact we don't use them at all they are kept in a locked cupboard on display, the only cold cathode devices we are using at the moment are Geissler tubes so I decided to test them with a Geiger counter which is only I% efficient for X rays but will give an idea. Of the two tested so far the Helium is not to bad with the GM tube held as close as possible to the cathode but the Neon goes of the scale of 600 counts per second ( and that should be multiplied by 100). I am going to inform the person who is using it and I suggest people using cold cathode sources in viewers have the!
m checked as well. P.J.Homer