In article ,
jim rozen wrote:
In article , Dave Martindale says...

The micrometer has both the usual scales on the thimble and a
mechanical digital counter display.

I have recently also found a very curious micrometer, with
mechanical counter display. It has a metric display and
metric screw, but the display is in the form of two lines
of digits in a window. The rightmost digit is simply
printed on the thimble, but the left digits are printed
on pentagonal prisms that are designed to rotate once
for each turn. Each prism has even or odd numbers printed
on it, 1 thru 9 or 0 thru 8. As the thimble turns,
each turn causes the prism to present the next face
to the user.

So they can provide all the needed digits for a 1"
metric micrometer, in one window with only two numbers.

Clever. I think it's brown and sharp.

TESA -- the Swiss company, sold in this country by B&S. I've
had one since about 1973 or so. In a hard-shell plastic case which
looks sort of like a blue/gray pistol holster. :-)

Enjoy,
DoN.
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