Digital Library Search
![Figure 63 ship4439.jpg Figure 63](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4439.jpg?itok=Owkoq1QE)
Description
Figure 63. Sorensen device for the determination of H+ ions. This device which measured the pH of water by a colorimetric method was devised by theDanish chemists Soren Peter Lauritz Sorensen and Sven Palitsch and usedduring the Danish oceanographic expedition on the THOR between 1908 and1910. (Image credit: Oceanographic Museum of Monaco | Y. Berard)