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    Re: Lunar Observation & Time Sight (1825)
    From: Jim Thompson
    Date: 2004 Sep 30, 07:12 -0300
    Fascinating, Frank.  Thanks.
     
    The image of the original logbook calculation page reveals an interesting insight to the "frought-with-errors" nature of CN: the navigator seems to have crossed out several digits as he worked the problem.  By way of trying to understand the human side of CN in those days, can you tell if he used a pen or a pencil? It appears that pencils were mass-produced in Europe from the 17th century, although it they were not mass-produced in the US until the mid-1800's owing to wars with Europe.  They were being manufactured in smaller numbers in the Boston area very early in the 19th century, and so could have been used by whalers in 1820.
    http://www.officemuseum.com/pencil_history.htm

    Jim Thompson
    jim2{at}jimthompson.net
    www.jimthompson.net
    Outgoing mail scanned by Norton Antivirus
    -----------------------------------------

    -----Original Message-----
    From: Navigation Mailing List On Behalf Of Frank Reed
    Last month I posted a link to a page from a logbook showing a complete lunar observation calculation AND the associated time sight from 1825. Since people have been talking about these sights, I decided to write up an analysis of this particular set of observations and calculations. This is a real, "at sea" lunar and time sight demonstrating actual practice in this time period. The address: 
    http://www.HistoricalAtlas.com/lunars/1825
       
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