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    Re: Puzzled by Douglas Protractor Instructions
    From: Martin Gardner
    Date: 2018 Feb 10, 07:14 -0800

    A very belated thank you to David Pike.  I submited this puzzle in April 2016.  There was one reply - from David.  Then 5 months later, more replies surfaced, including a definitive one from David - the result of careful research.

    I don't regularly follow NavList messages, so I completely missed the resurgence till I stumbled across it by accident today.

    I'm just delighted to have this puzzle resolved.

    Martin

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