"John" wrote in message
...

"Frank Erskine" wrote in message
...
On Sun, 31 Jan 2010 16:50:38 +0000, Dave
wrote:


What you wrote prompted to get mine out, micrometer, that is :-)

It doesn't have two lock rings, just an adjuster to take out the
backlash in the screw thread and the ability to rotate the fixed barrel
that has the 1/10000 vernier scale on it.

I think you probably mean 1/1000...

:-)

--
Frank Erskine

A M&W Micrometer can (optionally) have an additional vernier scale around
the sleeve to enable you to estimate 10,000 of an inch.


This link should take you to an illustration that shows the optional vernier
scale. For 0.0001"
http://www.moore-and-wright.com/imag...d_W_Poster.pdf.

Nowadays people seem to have too much reliance on digital instruments -
forgetting that the method of measuring still needs to be sound.