Instrumental pressure observations from the end of the 17th century: Leiden (The Netherlands)

We present a series of daily pressure readings taken 1697-1698 in Leiden (Netherlands)
by W. Senguerd. The readings were reviewed, converted to modern units, and reduced
to 0°C. The 2-yr series runs parallel with the Paris 1665-1713 and London 1697-1708
pressure series. Although the series covers a time span of 23 months only, it can be
regarded as a useful addition to the very few pressure series that extend back into the
17th century.