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Daily entries from the 17th century London diary
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John Napier or Neper (1550-1617), laird of Merchiston (now swallowed up in the enlarged Edinburgh of to-day, although the old castle still stands), and the inventor of logarithms. He published his “Rabdologiae seu numerationis per virgulas libri duo” in 1617, and the work was reprinted and translated into Italian (1623) and Dutch (1626). In 1667 William Leybourn published “The Art of Numbering by Speaking Rods, vulgarly termed Napier’s Bones.”