[Milsurplus] [ARC5] OT: What is the purpose of the 4th pointer on my Kollsman 671CLU-4-038 pressure altimeter?

[hwhall at compuserve.com]

Does it look like the illustration here:
https://en.wikipedia.org/wiki/Altimeter

 

 Wayne
WB4OGM

 

-----Original Message-----
From: Clare Owens <clare.owens at gmail.com>
To: Discussion of AN/ARC-5 military radio equipment. <ARC5 at mailman.qth.net>; armyradios <armyradios at yahoogroups.com>; Milsurplus <Milsurplus at mailman.qth.net>
Sent: Mon, Jul 11, 2016 4:18 pm
Subject: [ARC5] OT: What is the purpose of the 4th pointer on my Kollsman 671CLU-4-038 pressure altimeter?





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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