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    Protractor. Was: BRe: Perpendicularity check
    From: Alexandre Eremenko
    Date: 2004 Sep 22, 20:48 -0500

    Dear Robert,
    Interesting site, indeed! I did not know about it:
    www.warrenind.com/WKNavigation.html
    Could not find the prices of their merchandise though,
    or do they sell only on the phone rather than by Internet?
    
    Anyway, I bought my protractor from "tuchkan" of Kaliningrad.
    He has many of them, offers excellent photos and he is a nice
    guy in general. Other "Soviet" sellers, mmely.ru, maurnavy
    and bay_my_items also have plenty of them, just type "protractor"
    on e-bay search. The price seems to be almost standard on e-bay:
    $60 to $80. (I bought my one for $70.
    You can see it by typing the e-bay number
    3742233954 The whole link is too long to include).
    But you have to add about $60
    in the average for shipping and almost $40 or so for
    the money transfer, as the Soviets cannot use PayPal, and/or
    credit cards.
    These extras make many "Soviet" items non-competitive).
    
    On the protractor itself. It is made of some heavy alloy,
    probably brass. It resembles a sextant in construction:
    also has a worm skrew and a drum, actually two worms and two drums,
    for each moving hand. It comes in a wood box with a "passport"
    (=certificate), sometimes a brush. The certificate of my protractor
    lists the instrumental error for each 10 degrees of the limb,
    for each arm. The maximal correction is 2'.
    
    I wonder what they were (are??) used for. Except the evident
    task of determining a ship's position from the bearings of two
    angles between three objects.
    
    The book by A. J. Hughes "The Book of the Sextant" (1938)
    briefly mentions them, calling them "Station Pointers",
    has a picture of
    one, exactly like my one,
    and says: "A full description of the principle and use
    can be found in the Admiralty Manual on the station pointer".
    
    Can anyone suggest where to find this Manual, and/or what it
    contains??
    
    Alex.
    
    On Wed, 22 Sep 2004, Robert Gainer wrote:
    
    > Alex,
    > The super-precise 3-armed protractor that you allude
    > to is still made and
    > used in this country. You can buy it at the manufactures
    > web site at
    > www.warrenind.com/WKNavigation.html, it comes in a right hand
    > and left hand
    > version. I am interested in your 3-arm protractor.
    
    
    

       
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