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Eh?
MadMrH said:oh!
I did once hear of someone putting a bulb in theirs, I presume this helped them see inside it, cant think of any other use.
Ho ho ho.Gary Lightfoot said:That's a film projector like at the cinema.
Yes, we lost two cats and Grandma that way. It was tragicfortean said:One of the dangers of early projectors was that when they were left on without a source signal they bombarded the screen with massive amounts of CRT's...the screen achieving critical mass and collapsing in to a black hole.
fortean said:One of the dangers of early projectors was that when they were left on without a source signal they bombarded the screen with massive amounts of CRT's to create a black image. This resulted, after a few hours, in the screen achieving critical mass and collapsing in to a black hole. This black hole, ex screen, would then fall through the floor and continue until it reached the centre of the planet. Luckily a screen would reduce to less than a nanometre in diameter and so the damage to the floor, and the planet, was insignificant. To get around this problem modern CRT projectors produce a blue screen when there is no source signal present.
Gordon @ Convergent AV said:Hi Thunder,
I've done a couple of them.....the pcture doesn't do it justice....it's HUGE....Think of each tube as being like a portable TV and you get an idea of the size.
Gordon
fortean said:A CRT projector is unique in that it projects CRT's (Carbonised Radioactive Teleromes), usually on to a black screen. The screen of course looks white because it reflects all frequencies of the visible light spectrum. As everyone knows a surface of a particular colour can not reflect light of the same colour.
When these CRT's hit the screen they change the density of the molecules at the point of impact. As the density of a molecule increases it traps more and more light until it is at almost infinite density at which point enough light is trapped to make it appear black. By varying the amount and type of CRT's at any given point an image can be created on the screen.
One of the dangers of early projectors was that when they were left on without a source signal they bombarded the screen with massive amounts of CRT's to create a black image. This resulted, after a few hours, in the screen achieving critical mass and collapsing in to a black hole. This black hole, ex screen, would then fall through the floor and continue until it reached the centre of the planet. Luckily a screen would reduce to less than a nanometre in diameter and so the damage to the floor, and the planet, was insignificant. To get around this problem modern CRT projectors produce a blue screen when there is no source signal present.
fortean said:A CRT projector is unique in that it projects CRT's (Carbonised Radioactive Teleromes), usually on to a black screen. The screen of course looks white because it reflects all frequencies of the visible light spectrum. As everyone knows a surface of a particular colour can not reflect light of the same colour.
When these CRT's hit the screen they change the density of the molecules at the point of impact. As the density of a molecule increases it traps more and more light until it is at almost infinite density at which point enough light is trapped to make it appear black. By varying the amount and type of CRT's at any given point an image can be created on the screen.
One of the dangers of early projectors was that when they were left on without a source signal they bombarded the screen with massive amounts of CRT's to create a black image. This resulted, after a few hours, in the screen achieving critical mass and collapsing in to a black hole. This black hole, ex screen, would then fall through the floor and continue until it reached the centre of the planet. Luckily a screen would reduce to less than a nanometre in diameter and so the damage to the floor, and the planet, was insignificant. To get around this problem modern CRT projectors produce a blue screen when there is no source signal present.[
I'm not sure that they do stop at the centre of the earth. Taking into account momentum and of course the gravity of a black hole you get M2 + G = C where M is momentum, G is gravity and C, of course, is the speed of light. This tells you that the black hole will go straight through the Earth and go on out into space - in a straight line.
Relevant to this is an insurance claim going on in New Zealand where a house was destroyed by a mysterious projectile emanating from the centre of the Earth. Drawing a straight line through the centre brings you out in Chorley so it seems likely that the projectile was your screen. In order to be certain we need to know the date and exact time of the collapse of your screen into it's nucleonic state. Should it be your screen the insurance company will be looking to you for recompense.
welwynnick said:Ho ho ho.
And what kind of contrast do you get from one of those?
Nick
No bulbs = superior contrast + three dimensional image and a much longer life span
Thunder said:No they use Cathode Ray Tubes like a conventional television set. The projector has three of these, one each for red, green and blue. The light from the tube face is used to project the image through three lenses and the three images are converged onto a screen to provide a full colour image No bulbs = superior contrast + three dimensional image and a much longer life span
Thunder said:Well I know several people that use non fixed screens. I wouldnt say that 15000 hours is a short lifespan. Mines been up for nearly a year and hasnt needed any convergence adjustment yet. They definately give a more three dimensional image in my and most other eyes. The only one I will conceed is size and difficulty in set up. Otherwise its no contest