Peter wrote:
> But if it is held (potential wise) then there is at least one
> junction.

It could be made of the same metal as the cathode and tied to it, for
example.

> Is this what you mean ? Say, heat the tip of a grounded pin in vacuum
> and see what happens to an electron beam that passes very near it ?

Basically yes, although I object to saying "grounded" because there is no
ground reference defined yet.

> But there is already one junction on it, the grounded one. It could
> be made of the same material as the pin,

Right.  If the point is to prove that a junction is not necessary to observe
the Seebeck effect.

> but there still is a junction there.

Huh?

This discussion is getting silly.  There have been several posts and
references to papers explaining about the Seebeck effect and how
thermocouples harness it to measure a temperature difference.  Hopefully
nobody is confused anymore.  What is your point?


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