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    Re: About time - Antarctica
    From: Bruce J. Pennino
    Date: 2012 Mar 5, 13:49 -0500
    They were measuring 1000s of feet of depth. How could they "feel" when the object touched or  bounced off the bottom?

    Bruce J. Pennino, P.E.
    ----- Original Message -----
    Sent: Monday, March 05, 2012 12:27 PM
    Subject: [NavList] Re: About time - Antarctica

    Very much like using a hand lead line except it was a much heavier weight on a long wire which was on a motorized reel. This device was called a "deep sea lead."


    --- On Mon, 3/5/12, Bruce Pennino <bpennino.ce---.net> wrote:

    From: Bruce Pennino <bpennino.ce---.net>
    Subject: [NavList] About time - Antarctica
    To: NavList@fer3.com
    Date: Monday, March 5, 2012, 7:50 AM

    Just finished reading The Storied Ice by Joan Boothe. A very  good  overview book about all major explorations of Antarctica; many references.
    Anyway, Antarctica explorers had a longitude problem. In 1926-27 the Discovery "was the first vessel in these waters capable of receiving Greenwich time signals directly, and her men used the signals to check longitudinal positions on the maps."   Only Deception Island was properly located.
    Also,as the early explorers headed south ,they measured water depth for various reasons. How did they measure depths of several thousand feet with a drifting ship, angle of cable, flexibility(springiness)? 
    Boothe gives a brief overview of Cook's explorations....she says he was an extraordinary man. 

    Bruce Pennino
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