Simson, Robert, mathematician, born in Ayrshire; abandoned his intention of entering the Church and devoted himself to the congenial study of mathematics, of which he became professor in the old university at Glasgow (1711), a position he held for 50 years; was the author of the well-known “Elements of Euclid,” but is most celebrated as the first restorer of Euclid's lost treatise on “Porisms” (1687‒1768).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Sims, George Robert * Sinai, Mount