=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 09-Jul-1992 GAUGES IN EASTERN GERMANY (WISMAR, WARNEMUNDE, SASSNITZ, KOSEROW) AS OF MARCH 1992 ARE TYPE 'STEREMAT', VERTICAL DRUM, SWIMMER PRINCIPLE, MEASURES 1:10, CONTINUOUS REGISTRATION ON PAPER CHART. (INFORMATION FROM L.BALLANI, POTSDAM). 1882-1892 VALUES BASED ON 24 READINGS PER DAY; 1893-1931 VALUES BASED ON 4 READINGS PER DAY METRIC DATA MEASURED TO NORMAL NULL (NN)