[Milsurplus] OT: What is the purpose of the 4th pointer on my Kollsman 671CLU-4-038 pressure altimeter?

[Clare Owens]

Hi All,

The altimeter has the usual three pointers in its center, for
100/1000/10000 feet.  But it also has a little triangular pointer that
rotates around the edge of the dial and moves at about the same speed as
the 100 foot pointer.  When the three normal pointers are at zero, the one
on the edge ia pointing to just a little below 6.8.  Seems odd and I can't
find any reference to the edge pointer on line.

It looks like this unit needs to be recalibrated and I've found
instructions for that.

The altimeter has the typical Navy "US with anchor" stamp on its back.

Any Navy aviators out there?

Thanks,

Clare
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