Somebody expressesed concerns to me about non "plasma globe" globes
breaking under vacuum. I have never had one break on me, but if your
vacuum pump just happens to be stronger than mine (or if your globe is
cracked, or has a defect, or you are just unlucky) implosion is a real
risk. Just do any pumping in a safe area, so if the globe explodes you
will not die or get hurt. Be extra safe out there.
I have seen largish vessels implode, years ago, in inexpert hands.
The possibility is quite real. Eye protection is GOOD.
Small Plasma Tube:
This, from m emory, from a 'science eperimenter' type 'magazine'
late 50s. Never tried it, clearly doable.
Observe Safety Precautions.
Materials:
Most ANY low powered HV source, AC/DC/Pulse.
1/2 in ID glass/plastic tube, lenght to suit, maybe 6" was shown.
Corks/stoppers for both ends.
Bit of wire thru one cork for an electrode.
Bit of wire AND a bot of class/plastic/whatever tube thrue the
other.
12 to 24 inches of flexible plastic tube, to make a snug fit
on the cork thru the tube.
Two 'hand rollers' used to be common for linoleum block crafts.
(dunno if common any more: 1 in or so dia, 5 to 6 in long, with
handles.)
Wire power supply to electrodes.
flex tube to rigid tube thru corks.
corks in larger tube.
Secure bits to suit: rubber bands, duckt tape, whatever.
(may need spare hands....)
Using the rollers, alternately, compress the flex tube near the
larger rigid one, and 'roll away'. This consistutes a manual,
slow, simple, 'vacuum' pump.
Depending on the Supply voltage, at some point, variety of
corona affects will be seen, varying as pump down continues.
best
dwp
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