anyone wanting to find out more about these, please see my article on Bygraves and HR1/MHR1 at https://sites.google.com/site/sliderulesite/position-line-slide-rules
I know the treatment of celestial navigation is not perfect, but this article was meant to make the
subject somewhat understandable for slide rule enthusiasts, not advanced navigators ;-)
If you like to have your HR1/MHR1 (or Bygrave!) included in the list of known survivors, just drop me an e-mail and it will be in the next iteration of the article.
Have fun reading it!
Ronald van Riet
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