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    Re: Henry Hughes Sextant (No. 5154)
    From: Michael Bradley
    Date: 2019 May 29, 15:12 -0700

    The 'drum micrometer' replaced the 'tangent screw with vernier' around the end of WW1, 1918, I believe.

    That dates the subject sextant, with its tangent screw,  probably before 1918.

    I have no specific knowledge of the type.

    Michael Bradley

       
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