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Scales (dice)




I've always wondered why those scientific photos of meteorites
always have that tiny little dice cube. I know the dimensions
are 1 cm., but what do the letters and numbers mean? 

I've seen stuff like S1, W1, etc. they look like scrabble letters.
Is it a direction indicator?

-- 
          Jim Hurley
       Arachnaut's Lair
http://www.arachnaut.org/ >