On Feb 12, 10:57*am, (oldcoot) wrote:
Back in the 1950s when hobby grade transistors first became available,
there was an interesting homebrew project involving a parabolic
reflector from a spotlight, and a thermistor in place of the lightbulb
(a thermistor is a variable resistor sensitive to heat, the IR
equivalent of a photocell). It was placed in focal point of the
reflector, exactly where the bulb would go to genreate a collimated
beam.
* * * * * * * * *The thermistor was connected to a transistorized bridge
driving a zero-center meter (a meter whose needle stands straight up to
indicate 0, and then swings to either side to give positive or negative
readings. The meter was first zeroed with the "beam" reading ambient air
temperature. Then it was pointed at an object that was hotter than
ambient, and the needle swung right, indicating positive or "hot". Then
it was pointed at a bottle of cold Coke, and the needle swung left,
indicating negative or "cold". In giving the "cold" reading, the
thermistor was literally radiating IR, giving up heat to the bottle of
Coke through the collimated beam.

Good old teleportation taking place, via thermal photon exchange of
energy.

Take away such thermal energy and you've got nothing, or perhaps less
than nothing.

How cold is a black hole? (-???K)

How cold is antimatter (positrons)? (-???K)

~ BG