REGARDING Greenings chimney stack (Warrington Guardian, April 6).

I was employed at Greenings Wire Mill in the 1980s when the incident took place.

On Thursdays and Friday mornings I walked out to watch Fred working.

He had about four or five very wide tree trunks and he knocked three layers of bricks.

(about 12ins). He put the trunks in the gap, they were first soaked in some highly flammable liquid, he then took me across to the area where the stack would fall.

He put a chalk mark where he said the last brick would land.

On the Sunday morning he set fire to the trunks, as they burned the stack began to fall. He was less than four feet out with his forecast.

PETE CULLEN Ryfields