French demonstration using confetti to illustrate the effect of the barrel cooling system on the Lewis gun

[hw97karbine]

The gun's barrel shroud caused the muzzle blast to draw air over the barrel and cool it thanks to the radially finned aluminum heat sink between shroud and barrel

 

[Gnomey]

Nice one!

 

[Frog]

View attachment 829364

The gun's barrel shroud caused the muzzle blast to draw air over the barrel and cool it thanks to the radially finned aluminum heat sink between shroud and barrel

Along with those shipped by the British, 4000 Lewis MGs were manufactured in France by Darne.