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    Re: Artificial Horizon, K & E USN No. 6
    From: Bruce J. Pennino
    Date: 2012 Nov 29, 13:27 -0500
    It just dawned on me....obvious after looking at pictures of roof artificial horizons at the National Maritime Museum(Observatory).
    There is no missing transition piece on my AH.....just some sleeping brain cells in my head.  As you pointed out the brass domed nut is foreign... yup.... got at a local hardware store to act as a cap.  I found that the trough corner threads were 3/8" by trying different bolt sizes in my basement.    I never tried to put the domed cap nut on to the 3/8" bolt. Of course they match.  
    There was a  top cover of some sort just to keep the  tip threads from corroding . The cover was removed, the plug was removed, the trough was threaded onto tip (now broken). Entire unit inverted, Hg flowed. Etc.
    The trough is quite heavy  and the moment(torque) on tip could easily break it.  Maybe I'll just have the tip remachined...gotta think about it.  
    Thank you all for prodding my thinking on this 

    ----- Original Message -----
    Sent: Sunday, November 25, 2012 6:23 PM
    Subject: [NavList] Re: Artificial Horizon, K & E USN No. 6

    Thank you for posting these interesting images. What please are the diameter and height of the bottle?

    It is difficult to identify the materials. Some of the parts seem to be made of a yellow metal, but I would expect everything to be made of cast iron or steel, since many other metals and alloys are soluble in mercury.

    I suspect the brass domed nut is a "foreigner" and it would probably be safest to have the missing transition piece machined from cast iron or steel.

    Bill Morris
    New Zealand
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