I was just going through the following book
http://www.archive.org/download/firearm ... ich_bw.pdf" Our Rifles- firearms in American History series volume III"
And found an odd notation on page 203-204 about static electricity being generated by firing of the 1918 BAR, sufficient to throw sparks from the shooter.
I figure this was due to friction between the stock surface and the wool uniform tunics of the day. The rapid back and forth motion of the stock held tight to the body might cause this.
They were even suggesting using this tiny charge in some manner to cool the gun.
I'd only last night been thinking on several unusual methods of refrigeration that don't use the common cooling coils and compressors, one of which uses a diode that draws heat from one side to the other, the system being used for small fridges and coolers on boats.
Another odd method is the pitot tube cooler used to lower heat in an aircraft fuel tank at high speeds. It uses vibrations generated by airflow to draw away heat.
The above work is the first I know off that suggested using electricity to cool a weapon.
I suspect that the change of uniform from the old wool tunic made this a dead end anyway.
PS
Theres all sorts of odd stuff to be found in the old reference books, well worth looking them up.