4 Oct
2005
4 Oct
'05
6:02 p.m.
From: "der Mouse" <mouse at
rodents.montreal.qc.ca>
Hi
It usually takes a break such that the gun assembly goes
into the tube. This requires that it has a ring fracture
somewhere in front of the yoke. The assembly is then pulled
by 14.5 lbs towards the front screen. While some vacuum is
lost, as the gun is excelerating, if the diameter of the
assembly of gun and glass is large enough, it will be moving
quite fast before much vacuum is lost.
Assume that the break is such that a 12 inch diameter chunk,
including the neck breaks. Imaging that piece being pushed by
about 1800 lbs of force. How fast would you expect it to be
moving?
Not likely to break this way in most cases. It really depends
on stress, scratches and luck.
Dwight
I'll never seen anything horrendous in so far
as implosions. I used
to service Mac's "back in the day" and had to replace a few CRT's on
the original Macs. Apple would send the replacement monitor in a box
and inside was another box that you placed the whole mac inside of,
you'd follow the standard discharge and then purposely snap the tip
of the neck off the back of the monitor before closing up the box and
disposing of it, it was a scary moment the first time, but just a
quick zip of air and it was done, never had anything happen, did a
few dozen monitor replacements and disposals.
Yeah, a small crack in a not-particularly-stressed part of the tube is
rather unlikely to produce spectacular implosions. (The evacuation
pinch-off is about as unstressed a part of the tube as it gets.)
I remember, as a kid, going to the village dump. There were usually
some dead TVs with the cases gone, and I'd throw a rock into the CRTs
from as far away as I could throw rocks (even then I'd heard of CRT
implosion danger). Never seemed to be much more dramatic than a glass
vessel of similar size and shape with no pressure differential, but of
course I was rather far away. It also could be that a thrown rock is
not the sort of stress that produces implosion failures.