Re: CBM edge connectors pitch?

From: Justin Cordesman <>
Date: Thu, 13 Oct 2016 17:09:52 -0700
Message-Id: <>
Jim, the metric system was invented because Europeans can't do fractional math.


On Oct 13, 2016, at 18:57, Jim Brain < <> > wrote:

On 10/13/2016 1:12 PM, smf wrote:
 On 13/10/2016 18:38, Jim Brain wrote: 
 But, it was very common in the early 70's.  Lots of stuff was .156" 
 It's common now as well, I'd be interested in the history of that. It's probably boring, like someone used it for some random reason then everyone copied it. 
 It's not just computers that have strange measurements, 2 by fours are around 1.5 x 3.5 inches (metric 2 by fours are different again). 
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Not to get off-topic long term, but I completely understand 2x4s.




Short answer:


They were originally 2" by 4", but were rough.  "Dressing" them to finished lumber brought down the size, and the demands for dressed lumber, at consistent sizes, shipped via rail, forced the 2x4 to become 1.5" by 3.5"

 At one point, the size was 1 5/8 * 3 5/8, but it was harder to calculate, so 1.5 by 3.5 became the norm.
 Of course, that's in horrid imperial measurements.  No idea on metric.

Jim Brain


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Received on 2016-10-14 01:00:02

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