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    Re: A superb site for downloading the old
    From: Frank Reed CT
    Date: 2006 Apr 25, 16:46 EDT

    Alex E wrote:
    "In many places I see an article of Maskelyne
    on Hadley  octant mentioned, as
    "a supplement to 1774 almanac".
    Even the later  almanacs mention this.
    I downloaded the whole 1774 almanac and I
    do not  see any supplements in it.
    Where could they be??"
    
    On the site, you  will find THREE scans of a Nautical Almanac for 1774. One
    has 161 pages. The  others have 230 and 252 pages. Take a wild guess which one
    does NOT have  the appendix you're looking for.
    Here are my notes on the appendices from that year:
    appendix on the  elements of the lunar tables.
    appendix on Hadley's quadrant: adjusting for  back-observation, telescope
    collimation, swinging the arc, shade error, proper  sizing of mirrors.
    appendix by Lyons on positioning a meridianal  telescope.
    appendix by Lyons on using the "general tables of refraction and  parallax"
    (Shepherd's Cambridge Tables) for clearing lunars.
    
    A number of  the other almanacs appear in several versions. Some of these are
    actually second  editions, labeled that way on the title page. Generally, I
    picked the one with  the greater number of pages.
    
    -FER
    42.0N 87.7W, or 41.4N  72.1W.
    www.HistoricalAtlas.com/lunars
    
    
    

       
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