Warp wrote:
>   So how exactly do you express 7/10 inches? (Compare to 7mm being 7/10 cm.)
> How do you measure that with a ruler?

You don't do it that way. You measure in quarters and eighths.

You don't measure 7/10ths of an inch here any more than you measure a 
sixteenth of a meter where you are.

All the rulers are marked in half-inch, quarter-inch, eight-inch, etc.

http://thumbs.dreamstime.com/thumb_65/11497665910bMuRS.jpg

Now, sure, if you're doing science or engineering or something where you 
need to express 7/10th of an inch for some reason, then you express it 
as 7/10th of an inch. But at that point you're not likely using a ruler 
to measure it.

(Weren't the original DIP IC packages using 1/10th inch spacing between 
pins? Was that the same in Europe?)

-- 
   Darren New / San Diego, CA, USA (PST)
     "That's pretty. Where's that?"
          "It's the Age of Channelwood."
     "We should go there on vacation some time."

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