Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Determining Elevation with a Sextant
    From: George Huxtable
    Date: 2002 Mar 3, 13:23 +0000

    I know it's not relevant to navigation, but may I add a few words in reply
    to Dan Allen's question about finding the elevation of his home above sea
    level, using a sextant?
    I agree with those who said that a barometer was a more appropriate
    instrument, which just needs taking down to the nearest seashore for a
    comparison, thoroughly tapping it before and after.
    Another way would be to measure with a good thermometer the temperature of
    the steam that emerges from his kettle. Or apply the rule that says it's
    impossible to brew up a good cup of tea above 2000 feet, because it's so
    sensitive to the water temperature. Trouble with that one is that I have
    never, ever, succeeding in finding a decent cup of tea anywhere in the USA.
    Reminds me somewhat of a question in a physics exam, more than 50 years
    ago. The physics lab was a few storeys up from ground level, and the
    question asked was how would one find the height of the lab above ground
    using a mercury barometer. One student (not me) profferred the answer that
    he would drop the barometer out of the window and, with a stopwatch, time
    the interval before he heard the crash, then use Newton's laws of motion to
    derive the height. He got some marks for this, because the examiner
    conceded that although it wasn't the method that he had in mind, it would
    probably give a more accurate answer.
    George Huxtable.
    >Does anyone have any clever ideas about determining one's elevation above
    >sea level using a sextant?  What if one knows one's
    >latitude and longitude exactly -- would that help?
    >Daniel K. Allen
    George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    Tel. 01865 820222 or (int.) +44 1865 820222.

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site