Well Done That Man !
When I hoped for some quantitative observations I really did not hold much
hope.
John K.
----- Original Message -----
From: "ron" <[email protected]>
To: <[email protected]>
Sent: Thursday, May 30, 2013 11:10 PM
Subject: Re: [neonixie-l] Abridged summary of [email protected] -
10 Messages in 2 Topics
Hello!
All the hoopla about uv from the 866 got me to set one up and measure it.
I operated the tube with a 30ma sign transformer so it was not anywhere
near its full capacity but it had a nice blue glow between the cathode
cylinder and the anode. Using an ultraviolet meter calibrated to right at
full scale when pointed at the sun, there was absolutely no reading from
the 866. (the meter has no response whatsoever to visible light, no matter
how bright) So, the glass used in making the tube is apparently chosen to
absorb all of the UV. To test this theory I cut open the 866 (horrors!)
and took a piece of the envelope glass out into the sun with the meter.
The glass had minimal effect on the UV! So much for that theory! So the
866 glow apparently does not have much UV at 30 ma. Not much glow to look
at either though. Be a lot better to repackage the guts and fill it with
argon for a display lamp I would think. I'll do it when I get a chance and
post a youtube on it.
Oh, by the way. To the horror of the mercury vapor, I took the mercury
vapor meter (yes, I have fantastic equipment!) and did some measurements
around the broken tube. Right at the tube glass the meter pegged full
scale on the least sensitive range. Moving back a foot the meter barely
moved on the most sensitive range. (factor of 1000 more sensitive) Moving
back 3 feet, there was no detectible mercury reading at all. Mercury is a
very heavy molecule. Like a rock sinks in a pond, mercury vapor sinks in
the atmosphere to form a thin layer along the floor. Unless you have quite
a draft it stays down there. I certainly do not propose slopping mercury
all over the place though!
ron (glasslinger)
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