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    Re: Kollsman periscopic sextant mount Correction
    From: Fergus Kavanagh
    Date: 2016 Jan 28, 01:32 -0800

    Many thanks, Gary. I understand now (sort of) the IRB scale. I suspect the elevation scale issue may be due to previous dismantling and out-of-line reassembly,

    as was definitely the case with the IRB scale alignment.

    The FAA book is a gold mine for me, as my aim here is to be able to explain the principles of operation of aircraft systems to the museum's visitors.

       
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