Ivor and Olive Lewis on tue 2 mar 04
little hazy on this one
Dear Graig,
In the terms you describe it does seem to have an air of "Extrusion"
about it.
But it does not help to explain what happens to the speed of the smoke
up the stack or how this changes when the height of the chimney is
changed.
Best regards,
Ivor Lewis. Redhill, South Australia
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