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    Re: Zero Mag. Sight Tube
    From: Stan K
    Date: 2015 Oct 11, 20:33 -0400
    This discussion got me wondering.  I recently did some research trying to find the standard sextant with the longest usable arc.  I found it to be the Navy Mark II, with a usable arc of 145º.  If my calculations are correct, you would be able to, albeit with difficulty due to the index mirror being just a sliver in the horizon glass, take artificial horizon sights on the Sun any day of the summer up to a latitude of about 41ºN.

    BTW, I also have the bubble sight tube, and find it extremely difficult to use.

    Stan


    -----Original Message-----
    From: Sean C <NoReply_SeanC@fer3.com>
    To: slk1000 <slk1000---.com>
    Sent: Sun, Oct 11, 2015 10:06 am
    Subject: [NavList] Re: Zero Mag. Sight Tube

    Frank A.,
    Yes, I also have the bubble sight tube, although I haven't tried using it much. I haven't even determined the correction to use with it. I have the same problem as you, running out of arc in the summer, being at 37° North. After reading your post, I think I'll give it another try, as well. Thanks!
    Regards,
    Sean C.
       
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