On Thursday 05 May 2005 09:07 pm, Brian Clancy wrote:
pressure, otherwise you wouldn't get that "pop" when they break.
started messing around with this stuff.around with it, about 40 years or so
ago. Maybe more so if you're talking large transmitting tubes, but those
aren't exactly common.
but instead is a rather thick plastic that won't shatter. Early sets had a
separate safety glass and the face of the tube was much thinner. The other
reason it's that thick is because of lead in the glass to absorb x-rays, at
least for color tubes, which is what makes TV sets and monitors a bit
"hazmat" rather than just being able to put 'em in the trash. Monochrome
monitors and old B&W tv sets don't have that issue.
> Grant.I was of the impression that it was at somewhat lower than atmospheric
> Light bulbs contain inert gas at atmospheric pressure.
pressure, otherwise you wouldn't get that "pop" when they break.
> Vacuum tubes (thermionic valves) contain? a vacuum.As close as they could get to it, yeah.
> This is why the glass is so much thicker than a light bulb.Not that much thicker, overall. I sure broke enough of them when I first
started messing around with this stuff.around with it, about 40 years or so
ago. Maybe more so if you're talking large transmitting tubes, but those
aren't exactly common.
> The most dangerous example of the devices is the large TV picture tube.Those are rather dangerous, yeah.
> If you have a look the faceplate glass is quite thick, especially on theThe reason for that is two things -- that the outer layer of it isn't glass,
> super flat screens.
but instead is a rather thick plastic that won't shatter. Early sets had a
separate safety glass and the face of the tube was much thinner. The other
reason it's that thick is because of lead in the glass to absorb x-rays, at
least for color tubes, which is what makes TV sets and monitors a bit
"hazmat" rather than just being able to put 'em in the trash. Monochrome
monitors and old B&W tv sets don't have that issue.