On Sun, 23 Jan 2005 18:08:27 +1100, the inscrutable "Tom Miller"
spake:

A company called "Magnaflux" ?used to make equipment for checking cylinder
heads for cracks. They had a powerful magnet that latched onto the head. A
little puff pack then was used to spray powdered iron in the suspect area.
The powder built up around any discontinuity in the magnetic lines of force,
and showed up cracks even when they weren't visible otherwise.

I much preferred the dye magnaflux, SpotCheck.


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