Welcome to the NavList Message Boards.

NavList:

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

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Sextant used on Graf Zeppelin
    From: Frank Reed
    Date: 2010 Feb 14, 04:28 -0800

    Geoffrey, you wrote:
    "I find it curious that all the photos of sightings being taken with the Plath/Coutinho sextant on the Graf Zeppelin (that I have seen) show the index arm right back around the zero degrees altitude point "

    Yes indeed. I noticed that, too. But if you imagine yourself aboard the zeppelin, there is a simple explanation. As seen from the gondola, or control cab, the rest of the airship is a great grey cloud obscuring nearly all of the sky above roughly twenty degrees of altitude. So if you shoot altitudes from the control cab, they will necessarily be low altitudes. The photos then make great sense.

    But wait... We cannot conclude from this logic that sextant sights were always taken at low altitudes. That's just the best place for photography of the navigator at work. Those giant airships also had observing locations up top, accessible by long ladders in flight. A photographer could not follow the navigator up there easily. The relative frequency of sights from the control cab versus sights from the lookout positions atop the airships can only be judged from the actual logbooks. Those logbooks exist. So right there is a project for someone with the time to do the work that would likely lead to a definitive answer.


    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    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