On 2012-03-16, Ed Huntress wrote:
On Fri, 16 Mar 2012 18:15:18 +0700, John B.
wrote:

[ ... ]

Well, the air pressure theory was disproved. The last I read they were
theorizing about inter molecular adhesion and wondering about how to
prove it :-)

Would that not be "cohesion", not "adhesion" since it is between
two pieces of the same metal?

BTW I've never had a chance to try this, but do steel and
carbide and ceramic gauge blocks all wring together cross-species? (All
I have are steel ones.) If so, then we can eliminate cohesion as a
requirement. :-)

Yeah, that's pretty much it. Some years ago I posted here an article I
wrote about it over a decade ago, based on an interview with NIST's
scientist in charge of gage blocks and dimensional standards. He
basically said "Nobody has a clue." g

An honest answer.

Enjoy,
DoN.

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