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    Re: Traditional navigation by slide rule
    From: John Brown
    Date: 2016 Jan 20, 03:40 -0800

    Bob wrote:

    Podmore's trig scales are set up for degrees and minutes.  Having used those now, I am less convinced that they are better than decimal degrees.   The increments sometimes represent 30', sometimes 20', and sometimes 5', sometimes 2', 1', or 1/2'. A guy has got to think about his audience here... and I think people shift gears mentally to different increments  easier in decimal degrees than degrees and minutes.
    I am with Bob on this, given the attainable precision on a ten inch slide rule.  We don't seem to have a problem with the decimalisation of seconds of arc and mental interpolation.

     BTW, my C Plath sextant has no vernier on the micrometer screw.  I find it uncluttered and very easy to estimate the tenths.  

    John

       
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