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    Re: Measuring Dip in the 18th Century
    From: Ken Muldrew
    Date: 2014 Jan 1, 12:15 -0700

    On 2014-01-01, at 12:03 PM, Brad Morris wrote:


    From the pages provided Wright asserts

    1) that the solstice altitudes of the sun were observed with a quadrant. 
    2) that the observations were recorded to 1/2 arc minute

    Here is an example of a "quadrant" from the late 1500s.


    This is much different from the later reflecting quadrant used at sea.

    Ken Muldrew.

       
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