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    Re: Measuring Dip in the 18th Century
    From: Gary LaPook
    Date: 2013 Dec 28, 00:08 -0800

    Yes but I am away from home so will send it on Sunday. If anybody else is interested in receiving a copy of Wright's book please let me know, it is easier for me to send it one time to a group of recipients than to send it to one at a time.
    Gl

    Sent from Yahoo Mail on Android



    From: Alexandre Eremenko <eremenko@math.purdue.edu>;
    To: <garylapook@pacbell.net>;
    Subject: [NavList] Re: Measuring Dip in the 18th Century
    Sent: Fri, Dec 27, 2013 11:03:53 PM


    I am reading a book about Thomas Harriot (an outstanding British mathematician) In 1595, he wrote "Instructions for assisting the navigators of Sir Walter Raleigh's voyage to Guiana.
    The instructions contain the following dip table
    1 3'
    2 4'
    3 5'
    4 5'
    5 6'
    6 6'
    7 7'
    8 7'
    9 8'
    10 8',
    where the left column is the height in PASE's; according to the authr of the paper,
    1 pase=5 feet.

    The paper also has a reference to an early Portuguese source: Pedro Nunes, De arte ratione navigandi libri due (Coimbra, 1546).

    The article I am reading is Jon V. Pepper, Harriot's earlier works on mathematical navigation: theory and practice.

    Gary: have you received my request sent off-the-list?
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