You can use various on-line charts like http://en.wikipedia.org/wiki/Color_temperature to guess at the inside temperature, and this calculator http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/stefan.html to run various estimates of the heat radiation of the open end and of the rest of the black cylinder.
There are other critical things you cannot "know" from the photo alone, but that's where I stop. Jeff On Sat, Sep 8, 2012 at 5:17 PM, Alan Fletcher <a...@well.com> wrote: > Ha! I should have read the errata before I posted !!! They come to the > same conclusions. > > Inner Cylinder Hypothesis > • The inner cylinder hypothesis are wrong when it comes to radiation. > • The inner cylinder will only radiate from the area of the cylinder > opening > > At least it proves I'm awake ! > > ----- Original Message ----- > > > http://www.scribd.com/doc/105322688/Penon4-1 > > > http://www.scribd.com/doc/105325449/Hot-Cat-Data > > > http://www.scribd.com/doc/105326231/Corrections > > > > They assume that : > > > > > the energy radiated by the INNER cyclinder is identical to that of > > > the OUTER. > > > > I think that > > > > a) They assume it's all radiative (Though they comment on the air > > layer!) > > b) The ends are ignored > > > > Surely NO power will be radiated by the inner cylinder : anything > > radiated from one side of the inner will be absorbed by the other side > > of the inner. (For simplicity, assuming that each point radiates > > orthogonally only). > > > > Where's ... what's her name ... ? They really should have run a > > charged and an uncharged (blank) to calibrate their measurements). > >
