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    Re: Open a Mk IX bubble sextant
    From: David Pike
    Date: 2023 Nov 8, 11:33 -0800

    Michael Josefsson

    I copied pages from the MkIXBM manual for you, but Jean-Philippe has beaten me to it with the manual for MkIXA.  What I have got from the rear cover of one of Paul Brewer’s pamphlets is a cutaway drawing of how the MkIX reservoir cap is frequently presented compared to how it actually is.  I include the photograph below. 

    I just tried to make a bubble in my favorite MkIXBM exactly per the Manual, and I can assure you that the method works.  However, if the sextant’s been inactive for the last 70 years, you might just have to keep trying it, because if a clean chamber has no bubble, it’s hard to decide if it’s full of liquid or empty.   Incidentally, you won’t ruin a Hughes bubble chamber the first time you put it away with a bubble showing or the diaphragm unrelieved.   I think there must be a ‘gremlin’ in my sextant cupboard, because I frequently take out a bubble sextant and find it in that state, and I would never leave one like that, would I?  DaveP


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