He might be referring to something like this:


Wood Imprinting Set
http://www.pennstateind.com/store/EGSET.html

I believe it's a glorified soldering iron. I used to print on regular
paper with my ink jet printer and use my wife's clothes iron to get
the same results. Although, the transfer to wood was never 100%
perfect. I think I need to experiment more with this technique.

Roy