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    Re: Electrical Wire (minus 30???)
    From: Keith Williams
    Date: 2004 Mar 24, 15:58 +0000

    Are you sure you are using (or intending to use) a
    sextant at minus 30 or minus 40 (the latter being the
    same in degrees F and degrees C)?
    Without really good head protection (which would make
    using a sextant very difficult), my head hurt at that
    kind of temperature sufficiently to stop me being able
    to concentrate enough on any task as demanding as
    taking a sight...let alone the risk to skin from
    touching bare metal (and probably even from eyecup
    rubber, too) ..
    Are sextant calibrations valid at those levels?
    But as I've lived in temperate and hot climates, with
    only limited exposure to such extreme cold, I'm not as
    tough as I should be.
    Please tell us what drives you to do this!!
    best regards, Keith Williams
    PS - tinned wire doesn't "corrode" as quickly as
    untinned, which has a life of maybe 10 years in
    temperate salt-laden-air conditions (verigris builds up
    and the wire loses its coppery-nature even inside
    insulation and esp at connections, so resistance builds
    up, which can stop yopur equipment or even create a
    fire). But at minus 30 or so, I bet corrosion is a
    totally different game

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