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
    Name or NavList Code:
    Email:
       
    Reply
    Re: Sextant on ebay
    From: Bill B
    Date: 2006 Sep 6, 01:53 -0500

    Gentlemen

    If I recall, Alex's SNO-T (T for tropical?) is painted a light (metallic?)
    gray to reduce heat absorption.  Some manufacturers offer white "tropical"
    models if memory serves.

    I am not clear 0.005" to 0.010" of paint is a great insulator, therefore
    markedly reducing heat transfer to one's digits.  Especially as one hand
    grips the handle while the other tweaks the drum.

    Bill

    > Red wrote:
    >
    >> "it is not often that you see a polished metal sextant. " Probably
    >> because it is greatly impractical. In the noon sunlight, it would burn
    >> your hands (bare metal) and blind you from glare spots.
    >
    >
    > Why would a highly reflectent polished surface get hotter than one that
    > is painted black? In fact, Plath tried to find a compromise between
    > reducing heat absorption and avoiding glare spots with a model that was
    > painted white.
    >
    > Herbert Prinz


    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To , send email to NavList-@fer3.com
    -~----------~----~----~----~------~----~------~--~---

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

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

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

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

    Email Settings

    NavList ID 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