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    Re: Sextant with an umbrella
    From: Greg Rudzinski
    Date: 2015 Oct 1, 14:15 -0700

    I'm betting that it is a coincidence range finder.

    https://en.wikipedia.org/wiki/Coincidence_rangefinder

    Greg Rudzinski

    From: Frank Reed
    Date: 2015 Oct 1, 11:25 -0700

    What's going on in this photo? Is the "umbrella" some sort of prismatic device for backsights?? 

    Frank Reed



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