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File:Bettini(1660)-(4).svg
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Summary

DescriptionBettini(1660)-(4).svg

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).
Permission
(Reusing this file)
This image is licensed under a Creative Commons Attribution-Share Alike licence, which gives you permission——to freely use the image for any purpose, so long as you attribute it as requested here, and make any modified versions of it available under an identical license. If you want to use this image under a different license, for example if you can't give attribution. Or if you can't share a derivative work under the same licence, then please get in touch.

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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This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
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Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner. But not in any way that suggests the licensor endorses you/your use.
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https://creativecommons.org/licenses/by-sa/3.0CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 truetrue

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current16:16, 14 September 2015Thumbnail for version as of 16:16, 14 September 20151,576 × 975 (49 KB)ClemRutter

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