Never mind.

sometimes I think freedom of speech is not such a good thing ;)

Imagine the following scenario:



You are rotating the PJ somewhat while moving leftward and not keeping the lens perpendicular to the screen.

You're sliding the body of the PJ so fast that inertia keeps the lens in the same place? You're simultaneously using horizontal lens shift? You're moving the screen at the same time? :p

you don't actually have a projector and it was just a dream.

You need to take a course in Quantum Mechanics to really understand what is going on here. There are subtle forces at work that you are unaware of. Look to the theory of relativity for your answer. ;)

Its the Heisenberg uncertainty principle at work here.

I think it's the Heizenberg Uncertaintly Principle that states "The position and velocity of projector cannot be determined simultaneously"

I'd bet M.C. Escher could solve the riddle... :p

http://en.wikipedia.org/wiki/Image:Escher_Waterfall.jpg

My question for you is "How does this relate to a projector over $3k?"

Maybe you didn't wait long enough. You push the projector sideways, but you are still seeing the light that reflected off the screen (distance*2/c) ago, where c is the speed of light. You have to wait a bit longer to see the shifted light reflect.

Have you had the speed of light tested in your room recently? Don't forget, the speed of light is only constant in a vacuum, it can slow down in other media.

We need to get a room speed of light calibration thread going. I can just picture it, tanks in the back of the room slowly hissing helium and neon into the room to adjust the air mix. Of course, the air mix also affect the audio, so compromises will be in order.

Can you try waiting a bit longer (three hours should be plenty) and report back?

George Bush, Dick Cheney, and Condi Rice meet a group of scientists to discuss global warming. Right off the bat, the three question the scientific expertise of the scientists, so one of the scientists wants to know, whether the three have enough basic science knowledge to even discus the issues. So he asks a simple question: What is faster, the speed of sound or the speed of light?

Condi: Obviously, sound is faster than light. When I turn on my TV, the sound comes up first and the image appears later.

Dick: Nah, Condi, I think you got that wrong. I have this radio and when I turn that on, the light comes up instantly, but the sound takes a little longer.

The scientist then confirms that the speed of light is in fact faster than that of sound. But immediately George jumps in.

George: Nonono, you all got it wrong. I am the decider and I know that both sound and light travel at the same speed. The reason why some folks think that light is faster is just because our eyes are in front of our ears.

George Bush, Dick Cheney, and Condi Rice meet a group of scientists to discuss global warming. Right off the bat, the three question the scientific expertise of the scientists, so one of the scientists wants to know, whether the three have enough basic science knowledge to even discus the issues. So he asks a simple question: What is faster, the speed of sound or the speed of light?

Condi: Obviously, sound is faster than light. When I turn on my TV, the sound comes up first and the image appears later.

Dick: Nah, Condi, I think you got that wrong. I have this radio and when I turn that on, the light comes up instantly, but the sound takes a little longer.

The scientist then confirms that the speed of light is in fact faster than that of sound. But immediately George jumps in.

George: Nonono, you all got it wrong. I am the decider and I know that both sound and light travel at the same speed. The reason why some folks think that light is faster is just because our eyes are in front of our ears.


The most fictional statement in this joke is "George Bush, Dick Cheney, and Condi Rice meet a group of scientists to discuss global warming."

If you want to be really sure you are not pivoting the PJ as you slide it, go measure the height of the right and left sides of your image area before and after the move. You should see some horizontal keystone if you are pivoting it.

Sorry for the serious answer.

BB

Admission is 1 dollar. :D

u take paypal? ;)

Put the projector on a skateboard or otherwise and roll it parallel to the screen to avoid pivot. Very little pivot will cause this effect. If you have doubts throw up a convergence grid and measure the squares at the far edge after you move the projector. Oh, and lay off the hooch...

George Bush, Dick Cheney, and Condi Rice meet a group of scientists to discuss global warming. Right off the bat, the three question the scientific expertise of the scientists, so one of the scientists wants to know, whether the three have enough basic science knowledge to even discus the issues. So he asks a simple question: What is faster, the speed of sound or the speed of light?

Condi: Obviously, sound is faster than light. When I turn on my TV, the sound comes up first and the image appears later.

Dick: Nah, Condi, I think you got that wrong. I have this radio and when I turn that on, the light comes up instantly, but the sound takes a little longer.

The scientist then confirms that the speed of light is in fact faster than that of sound. But immediately George jumps in.

George: Nonono, you all got it wrong. I am the decider and I know that both sound and light travel at the same speed. The reason why some folks think that light is faster is just because our eyes are in front of our ears.


The real answer is never trust a politician to answer what's causing global warming... neither Gore nor Bush. :rolleyes:

C'mon, admit that you are using one of those new Bose-Einstein condensate (http://www.physics.hku.hk/~tboyce/sf/topics/lightfreeze/lightfreeze.html) screen prototypes. I believe it works for teleportion too. :cool: (literally)

Shouldn't his be in the I've too much money forum? (http://www.avsforum.com/avs-vb/forumdisplay.php?s=&daysprune=30&f=86) or maybe the speaker forum?

Peyote anyone? :D
Psylocibin is easier on the nerves. ;)

As rediculous at this thread is, I am actually looking for an explanation (not that it really matters anyway -- it was late when I started the thread, and I was bored).

But I'm tellin' ya, if I did this little trick in front of you it would look like slight of hand.

Since I haul my projector out and place it on a table behind my couch every time I want to use it and have to align it every time, I am actually a little familiar with what you are describing. But shoving a projector sideways with something like a 15' throw, the amount of pivot necessary for the image to not move laterally is really small.

I like the skateboard idea, but you need to try it the same direction twice, once with the skateboard facing forward, once backward, because the weight of the PJ might flex the trucks one way or the other and introduce pivot back into the mix.

BB

CO2 and methane cause global warming. Livestock flatulence accounts for more CO2 and methane emissions than all cars, planes, and all other forms of human transport combined. Obviously cow farts play a significant role in the phenomenon you are witnessing gremmy. Nah, must be your SUV (it's > $3k and safe to discuss here, right?). No matter...whatever the cause, we should at least be able to agree that we need to dramatically raise taxes to put a stop to it. Think of the children!

The whole livestock/methane global warming issue is bull****. Do you know how many Bison roamed the plains? 10% more than the current livestock count. That leaves all the modern gas producers to blame for global warming. However, we are not sure how much gas is being produced in Gremmy's home theater by his local fauna.

Growth of exotic herbs within my home theater currently accounts for 1 half of the total world's consumption of C02. If my theater is ever destroyed in a fire, global warming will become unstoppable, and Florida will be underwater within 2 days. :D

::Serious Mode On::

I am reluctant to say this, since it's totally off topic, and since it's probably not appropriate for AVS forum, but here goes. I'll say my piece on global warming and then I'm done, since this really isn't the place for it.

Point 1) Global warming is real. C02 output from human beings is responsible. The melting of the world's glaciers and the current warming trend is not just part of "Mother Nature's natural cycle." The last time I checked, every single scientific article published in peer reviewed journals agreed that global warming was real and that human beings were the primary causation.

Point 2) The average person doesn't really understand it because the media gives the impression that the scientific community is torn on the issue, partly (though perhaps not entirely) because the big oil/energy companies are engaged in a campaign of B.S. very similar to that which took place amongst the tobacco companies in relation to the cancer causing effects of their product.

Point 3) While it is still scientifically possible to stop global warming in its tracks, the world WILL not react. Mark my words. Some of the biggest, most populous nations in the world are ramping up their industrial sectors. Even if the United States stops dumping C02 into the atmosphere, the rest of the world will not.

Point 4) I am not a political person by nature. Normally I just don't give a crap. But I'm a little OCD when it comes to research, and this is a topic I've researched. The alarmists are correct.

Point 5) This is not the first time that a single organism has changed the composition of the earth's atmosphere. Cyanobacteria in the world's oceans were largely responsible for all the lovely breathable oxygen that we have floating around today. Man is relatively small in numbers, but man has technology, and technology makes man a force of nature much more potent than anything the world has seen before.

Point 6) Joe Public will not wake up and smell the coffee until it's too late. This problem will be largely unaddressed (and even scoffed at by many) until the effects are blatantly obvious to everyone, and by then we'll be knee deep in problems the sort of which man has never seen.

Point 7) I'm not calling for reform, raising taxes, or imposing restrictions. I think human nature makes such cries for action pointless.

In other words, poor yourself a glass of lemonade, pull out a lawn chair, and watch the world melt. Or better yet, spend all your time sliding your projector back and forth on a skate board, like I'll be doing.

::SERIOUS MODE OFF::

Okay guys, this thread has been fun and entertaining, but my style of political debate is to cut and run. :D

Anyone who wants to debate this with me is welcome to do so in a PM, but if we do it here we're just going to get shut down. :D


Nah... aliens are causing global warming... ;)

http://www.crichton-official.com/speeches/speeches_quote04.html

Thanks for the link. Very entertaining, but Crichton should stick to writing books. That speech is the most insane discussion about global warming I have read to date. I wish he would do one on HT projectors and see how much consensus he would generate on AVS :D

....

I'll say my piece on global warming and then I'm done, since this really isn't the place for it.

....

That was the only thing in your post that there is no dispute about.

Nah... aliens are causing global warming... ;)

http://www.crichton-official.com/speeches/speeches_quote04.html

This is going to sound like a lame request, so I apologize ahead of time. But if you could please delete your quote of my unfortunate global warming tirade, I will delete this post, and then I will retire from this ill-conceived thread permanently.

I'm taking a break from this place.