Re: Happy Fun Band...

Certainly they don't blow the glass with the rim in place, it is added
BEFORE it is evacuated. The steel band is there because a rectangular tube
is NOT the strongest shape in the world when under stress. The original
picture tubes were round, until they figured out the principle of wrapping
a band around the tube to hold it together. This band is the same as the
trunions added to cast iron cannons in the 1400's to make them much
stronger.There is quite a bit of history to this band, and as it has been
said before "He who forgets the past is condemned to repeat it"

I was looking around the web and found this reference to a different
application that showed how a reinforcing band made a considerable
difference...
http://water-rockets.com/safety/

John :-#)#
(unfortunately this is not very vector-related, other than safety in
handling the tubes, which I guess is important to iron out.)

At 11:24 PM 12/9/1999 -0500, you wrote:
>I don't want to ressurect a bad topic, but I don't buy the thing about the
>band around the tube being critical anyway. Do you suppose they blow the
>tube with the band in place? NO. I think if you try to take it off, you'll
>probably accidentally cause stress somewhere and OOPS! That's all. Doesn't
>matter either way. It's like arguing over predestination... it doesn't
>change the fact that you do what you should do and don't do what you
>shouldn't. :-) my 1/2 cents.
>James
>
>
>----- Original Message -----

From: David Shuman <dshuman@mindspring.com>
>To: <vectorlist@lists.cc.utexas.edu>
>Sent: Thursday, December 09, 1999 6:12 PM
>Subject: Re: Happy Fun Band...
>
>
> > Doug Jefferys wrote:
> > > ...I actually got a little curious as to the metal rim band of a CRT and
> > > did some poking around on USENET. As a matter of fact, a few people
> > > *have* removed it while the tube was under vacuum and lived to tell
> > > about it, but only barely:
> > > In a nutshell, taunting happy fun band results in an almost immediate
> > > implosion.
> >
> > I had an incident a few years ago in which a Space Fury (sold to me by
> > Duncan Brown; note this is clearly on-topic for vectorlist) tipped over...
> > the plywood frame around the monitor got crunched, and the CRT slipped out
> > of its band. (The bolts holding the CRT to the frame were attached to the
> > band.)
> >
> > The CRT didn't implode--sounds like I got lucky! I never was able to get
> > that band back on, though.
> >
> > --
> > Dave
> >
> >

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Received on Thu Dec 9 23:56:20 1999