Figure 13. Ekman piezometer - In 1904 Vagn Walfrid Ekman of Switzerland, a
member of the Central Laboratory of Christiana, was tasked with studying the
compressibility of sea water in relation to salinity and temperature. He devise
d a new model of piezometer, first used in 1905 and first described in 1908. It
s most important readings were from the PRINCESS ALICE II in 1906.