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    Re: Mariner's astrolabe from Museo Naval de Madrid
    From: Andrew Nikitin
    Date: 2019 Apr 12, 07:18 -0700

    > From: Andrés Ruiz
    > Did you see the Malaspina´s quadrant at the Museo Naval de Madrid,
    > (manufactured by Ramsden)?
    > http://fer3.com/arc/m2.aspx/Malaspina-Andr%C3%A9sRuiz-oct-2007-g3381

    Sadly, no. Only one room of the permanent exposition was open (one of the 2
    with stained glass ceiling) and it only had one stand with navigational
    instruments. I posted a strange mariner's astrolabe, there was also a
    backstaff, a compass, a hourglass, an armillary sphere and, I think, a nocturnal.

    > From: Ed Popko
    > I consider this museum one of the best in the world. The collection is amazing...
    > ... it's worth revisiting the museum whenever possible.

    I completely agree. I visited only one hall and certainly want more.

    As a consolation, I found this google street view tour to wet my appetite and
    know what to look forward to if I ever visit Madrid again. For those of you who
    has seen the entire thing, it may be worth visiting to compare what's changed.



    > From: Alexandre Eremenko
    > Did you record by chance where does it come from and when was it made?

    I do not think there was a label for that item. I cannot read spanish without
    google translate and there was only one text plaque for the entire "navigation
    instruments" table. I am not sure if it speaks about all the presented
    instruments, or just about the (suspected) nocturnal.

    I am not sure about the intended use of that astrolabe. I do not think it is possible to achieve
    6' accuracy when measuring altitude with a free-hanging hand held device, so it could be
    for something else. Maybe some form of early bearing circle? After all, the maker seem to go
    to some trouble to make it lay flat.



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