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Warbirds Member Has Question About Altimeters

Altimeter

One of our fellow Warbirds of America members, Gennaro Avolio, WOA 551224, has sent us a question about the pointers on an altimeter that ride the outer edge of the display face. Do you have an answer? Or maybe a question for next month? I see a series here!

I’m sending a photo of a couple of old-style Kollsman altimeters and hoping there is someone who can give me some information about them. You will note that there are auxiliary pointers on the altimeters; they are easier to see on the left altimeter. I’m talking about the small triangular pointers on the outer 100-foot scale and the inner part of the same scale. I remember dozing through a navigation class where the pointers were explained.

However, I now cannot remember what was said. I find that the pointers are only on Kollsman altimeters. The pointers move when the Kollsman window is set, and they move when the pressure changes. I would really like to know their function. The pointers are not found on more modern altimeters, so I’m hoping that there are some ancient codgers in the Warbirds community who know their function.

Thanks for any help,
Gennaro Avolio, WOA 551224

Okay, readers, get to work! We await your collective wisdom. (Not all replies will be published, some limitations apply, and no prize for first, second, or any other place.) Send your response to: warbirds@eaa.org.

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