The best description I have run across so far on the net is this one:

	http://www.michsci.com/documents/TechNote102-B.pdf

After reading this, it can be seen that the thermocouple effect occurs 
with or without junctions.

In the real world, it is very difficult to do anything with a 
thermocouple without junctions.  But the junction only allows you to use 
the thermocouple; it doesn't create it.

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