Very wonderful.
The heat conduction of a copper made coffee roaster is overwhelming.
music Boston Horns : Pink Polyester
=The thermal conductivity=
https://en.wikipedia.org/wiki/Thermal_conductivity
http://goo.gl/sjyzfa
Reference materials
Picasa http://goo.gl/FIctNz
https://youtu.be/h3hLcuqsT_Q
