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    Re: John Wesley Powell Expedition
    From: Don Seltzer
    Date: 2017 Apr 25, 20:26 -0400

    On Tue, Apr 25, 2017 at 6:58 PM, Greg Rudzinski <NoReply_Rudzinski@fer3.com> wrote:
    A few years back there was posting on a planned trip down the Grand Canyon as Powell did it and some questions on how he used sextant, artificial horizon, and chronometers. I can't find these old posts in the archives but have found the documentary this guy did on YouTube which may be of interest to you (see link).

    That was Sam Willis, a well-regarded naval historian. I suggest contacting him directly, as he may have access to some of the original JW Powell source material.

    Two of the practical problems are high canyon walls to climb and using an artificial horizon in those latitudes in the summer.

    Don Seltzer
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