[WWI] Answer to question

Andy Bannister a.bann at ntlworld.com
Thu Apr 19 12:13:48 EDT 2007

> My undrstanding is that the "Machine Turned" finish was a purely decorative process.  Typically, large aluminum panels were formed using a hammer and a form to shape the part.
> When the shaping was finished, the surface appearance contained lots of bumps.  The machine turning cleaned up the surface.

That makes sense, thanks for that. Somehow I've had it in my head all these years that it was some kind of corrosion preventative but I could never figure out how. 


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