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    Re: Visiting local museum and CN-items
    From: Igor S.
    Date: 2019 Dec 19, 00:53 -0800

    Thank you Alex! I found a photo on internet of a complete device (see the photo attached).

    The old sextant (Fig 3) might be one from J.D. Potter instrument maker https://www.bidsquare.com/online-auctions/skinner/j-d-potter-anodized-brass-sextant-784263 which is very similar.

    Igor.

    Re: Visiting local museum and CN-items
    From: Alexandre Eremenko
    Date: 2019 Dec 18, 09:09 +0000

    Fig 1 seems to be a part of a dead reckoning calculator (you enter the course, 
    drift speed and time and it gives your position with respect to departure 
    point. The device seems to be incomplete.
    
    Fig 2.  is an "altitude and azimuth instrument", also called "universal 
    instrument". It is used in geodesy, but cannot be used from a ship at sea. It 
    is similar to theodolite but the mounting permits to point it at zenith. 
    
    Fig 3. is an old sextant, probably 2-nd half of 19th century 
    
    Alex.
     
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