Shots of pigs in barn + shots of contraption for creating methane gas.
Unissued / unused material - dates and locations unclear or unknown.
Methane gas from pigs.
Various shots pigs and piglets snuffling about in a barn.
Various shots man standing outside barn - he holds a burning camping gas cylinder in his hand. The burning cylinder is held over a pipe emitting methane gas creating a flame. The pipe is attached to covered and uncovered tanks by various pipes and dials, in the open tank we see murky water.