How would you read this altimeter?

Discussion in 'Flight Following' started by Everskyward, Oct 30, 2017.

  1. Everskyward

    Everskyward Administrator Management Council Member

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  2. Kritchlow

    Kritchlow Final Approach

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    Cm hg

    At least the inner scale. 71.5 cm hg would be a bit over 28 in hg.

    Another scale may be hecto pascals.
     
    Last edited: Oct 30, 2017
  3. Ravioli

    Ravioli Final Approach

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    Inaccurately to be sure... That's really cool though. Did you find that in your recent wanderings?
     
  4. wilkersk

    wilkersk Cleared for Takeoff

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    I had to research this. Thought I had it figured out. But, then I realized I was mixing in/hg and meters altitude. Doesn't work. So, after googling a bit, I found that this is a Goulier pocket barometer. It can be used to find altitude difference between 2 points based on barometric pressure change observed. A little different from our modern pressure compensated altimeters.
     
  5. Sac Arrow

    Sac Arrow Touchdown! Greaser!

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    Where did you get it?
     
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  6. Everskyward

    Everskyward Administrator Management Council Member

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    It's in a museum. In Paris...
     
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  7. Everskyward

    Everskyward Administrator Management Council Member

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    If the inner scale is cm of mercury, and 2.5 cm = 1 inch, then a change of 2.5 cm must be about 1000' altitude, or 300 meters. So the outside scale must be meters.
     
  8. GlennAB1

    GlennAB1 Ejection Handle Pulled

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    Damn, I was going to make an offer.
     
  9. Everskyward

    Everskyward Administrator Management Council Member

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    Go ahead. :)
     
  10. asicer

    asicer En-Route

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    You swipe, I fence? :)
     
  11. Bill Jennings

    Bill Jennings Final Approach

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    Gotta finance retirement somehow :cheers:
     
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  12. BigBadLou

    BigBadLou Final Approach

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    1700m, or 5600'.
    So either it is broken or there is a very very warm front with extremely low pressure sitting over Paris. :)
     
  13. ktup-flyer

    ktup-flyer Pattern Altitude

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    With a French accent
     
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  14. GlennAB1

    GlennAB1 Ejection Handle Pulled

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    Thanks, there are several, similar but different, models on eBay and etsy.
     
  15. paflyer

    paflyer Final Approach

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  16. GlennAB1

    GlennAB1 Ejection Handle Pulled

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    Or 71.4
     
  17. Pilawt

    Pilawt Final Approach

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    Where’s the Mode C output?
     
  18. Everskyward

    Everskyward Administrator Management Council Member

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    170 meters, which would make sense if it is reading 28" of mercury (71.5 cm). Not that I would expect it to be accurate after all these years of not being calibrated.
     
  19. Clark1961

    Clark1961 Touchdown! Greaser!

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    Why wouldn’t the museum curator set it to the proper reading?
     
  20. Kritchlow

    Kritchlow Final Approach

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    Perhaps that was close at the time???
     
  21. Clark1961

    Clark1961 Touchdown! Greaser!

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    It may be stuck after setting for years at one elevation...
     
  22. GlennAB1

    GlennAB1 Ejection Handle Pulled

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    LOL
     
  23. Everskyward

    Everskyward Administrator Management Council Member

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    The elevation of Paris is 35 meters, which means it's only 140 meters off. But who knows what the pressure altitude was that day...
     
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  24. GlennAB1

    GlennAB1 Ejection Handle Pulled

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    How would I read it?

    Very carefully!