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I suggest you check the stability of your voltage supply and regulator to the lamps...Even though Halogens are suppose to be very stable, they are voltage sensitive. If you are using Tungsten halogen lamps the spectral output can be very sensitive to the energy supplied to (and the temperature...

William; The force of gravity doesn't depend upon the weight of the object dropped. Watch what happens when a feather and a hammer are dropped by an astronaut on the moon (no wind or air resistance).: ://www.youtube.com/watch?v=5C5_dOEyAfk

OK; Sorry, I made another mis-statement (but only in point #2). withregards to the experimental apparatus in the video my statement that "increase in pressure changes temp." is not necessarily true because the number of moles of gas, n, is not constant. However, it would be applicable to the...

Yes, he did say 1 cm. - My mistake... BUT, The point I was making is that you CANNOT use the ambient temperature OUTSIDE the glass, especially in an OPEN system; at least not in his experimental set up because: 1. I don't think its possible for the INSIDE temp. to reach thermal equilibrium...

The transmission of IR depeds upon the type of glass; here's great little tutorial showing the transmission of various materials at various IR wavelengths.: http://www.edmundoptics.com/resources/application-notes/optics/the-correct-material-for-infrared-applications/ I'll address some more...

OMCheeto; the Video in your first post provided some excellent info...and the raw data chart was nice. Where did you get the data chart above? How long did you keep it in the freezer before measuring ? It has to reach equilibrium Temp. And of course, the temperature , even if accurately...

Thanks, Simon, for resurrecting the original post by Peter Terren. I had just decided yesterday to get a radiometer and begin experimenting with lasers when I came across your post. The OP had lots of good info about laser interactions. If I am not mistaken, he came to the conclusion that his...

Thanks Andy; In light of that article you linked with regards to eliminating blooming, it may be helpful to know precisely what you have: I'm not an imaging expert, but... ... do you know how many megapixels you have?? From this list of Sonys any sensor that has 12 MP or better appears to be...

Nice pics, Andy. Do you have CCD or CMOS imaging?

I kinda like this one:

I used to have one for demonstration...need to find a current source ...maybe a small 1 inch diameter disk...or preferably a ring. Any sources? Thx.

Pretty awesome radio-photos , Greg. I was unaware about such small asteroids having moons... Furthermore, that is an incredible series of shots, and showing great detail. I wish they would have given the time between each frame so we could determine the rotation rate; it appears to be a shot...

Very interesting, Steve... Furthermore, a prograde equatorial orbiting clock and a retrograde orbiting clock would have different proper periods, t, ... the difference given by ... (t+) −(t−) ≈ 4πJ/(Mc^2). And which, remarkably, is not dependent upon G or the orbital radius...as pointed out...

So you are saying that zero point energy doesn't exist?

Fun Fact #2... apparently that "gas" contains molecular layers of H2O and CO. http://www.aanda.org/articles/aa/abs/2013/06/aa20920-12/aa20920-12.html