Archive of the month

During 2019 we will be celebrating a “Year of Discovery” which will be an opportunity to :

  • look at inventive individuals who have carried out pioneering work in the fields of aeronautics, archaeology, mathematics, Celtic studies etc.
  • find out about adventurous Welsh men and women who have travelled the world as settlers or missionaries
  • discover more about new and exciting resources for researchers in the Archives and Special Collections

The “Year of Discovery” will enable us to build a multi-layered view of our collections  -  presenting our strengths and what makes us distinctive from other institutions throughout Wales.

March 2019


William Jones by William Hogarth, oil on canvas, 1740 ( © National Portrait Gallery, London 5734)
along with the title page from his volume on arithmetic and geometry published in 1706

William Jones (1675-1749), Welsh mathematician and pioneer

On the 14th of March we celebrate pi day – the symbol π (Greek letter for ‘pi’) used to designate the ratio of the circumference of a circle to its diameter, which is approximately 3.14159.

This day is also an opportunity for us to honour William Jones, the Welsh mathematician from Llanfihangel Tre’r Beirdd, Anglesey who became a fellow of the Royal Society in 1711 and was a close friend of Sir Isaac Newton and Sir Edmund Halley.

Jones’s publication Synopsis palmariorum matheseos, or, A new introduction to mathermatics appeared in 1706 and the symbol π was used to represent the ratio of the circumference of a circle to its diameter for the first time in this book.

Today π is instantly recognised worldwide but few know that its history can be traced back to a small village in the heart of Anglesey.


                                                            This "Archive of the Month" was created by Elen Wyn Simpson, Archivist


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  • April 2013
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  • December 2013