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File:Bettini(1660)-(5).svg

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Bettini method (1660) The JesuitMario Bettini penned a method which was posthumously published in the book Recreationum Mathematicarum Apiaria Novissima 1660.

  • Draw the gnonomic triangle with the hypotenuse against the meridian line, and φ to the bottom, C. The other point call M, the right angle call G.
  • A horizontal line is drawn through M, this is the equinoctial
  • A circle centred an M with a radius MG is drawn. G2 and G3 are the intersections of the circle and meridian.
  • In the top quadrants, points are marked each 30°. Two are named P, Q.
  • Construction lines are drawn from G2 and G3 through P and Q- the intersections with the equinoctial are marked.
  • To finish the hourlines are drawn through these points from C, and the dial squared off.
The afternoon dial is a reflection of this
Source Own work
Author Photograph by Clem Rutter, Rochester, Kent. (www.clemrutter.net).
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If you use this image outside of the Wikimedia projects, then I'd appreciate it if you would let me know. Though this isn't compulsory, it seems only fair . Thanks!

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