420 



Alf Trolle. 



Date 



True Time 



Height 



of water 



cm. 



Remarks 





б /vii 08 



8.30 p. m. 



100.5 







— 



8.40 - 

 8.50 - 



100 

 99.5 







— 



9.00 - 



99.6 



5/vii. Lowwater 9.00 p.m. 





— 



9.10 - 



99.6 







— 



9.20 - 



100 







— 



10.10 - 



103 







6/VII - 



2.35 a. m. 



173 







— 



2.40 - 

 2.60 - 



173 

 174 







— 



3.00 - 



174 



6/vii. Highwater 3.00 a. m. 5/vii. 



С culm. 5.15 p. m. 



— 



3.10 - 



174 



tr. t. Tidal period 9 h. 45 m. 





— 



3.20 - 



173.6 







— 



3.30 - 



173 









3.40 - 

 6.30 - 



172.5 

 134 







Average tidal period at Maroussia from 30/vi — 6/vii 08 10 h. 6 m. 

 Moon's phases : 28/vi • New moon. 6/vii î First quarter. 



During the same period the temperature and salinity at a depth 

 of 100 m. were higher in the day than at night. 



29/vi 



3/vn +1.34 

 4/vii +1.39 



Day highwater 



100 m. 

 temp. salin. 



+1.33 33.84 



33.84 



Night highwater 



100 m. 

 temp. salin. 



30/VI +1.42 33.62 



1— 2/vn +1.49 33.67 



The currents caused by the tides Ьал'е already been discussed. 

 Table 12 shows, that during the period dealt with the surface current 

 changed direction at highwater, with a single exception somewhat 

 before the time of highest water, but the current in the deeper layers 

 nearly at that time, and that the change at lowwater at the surface 

 during the same period took placé* at a somewhat later time than the 

 lowest height of the water, but in the deeper layers almost at that 

 time. 



This condition was caused by the fresh water which flowed out 

 from the rivers at the surface during the summer. 



To make these measurements comparable with those taken by 

 First-lieut. Bistrup in Danmarks Havn in the winter half-year, a 

 series of simultaneous tidal measurements were made at Maroussia 

 and in Danmarks Havn on 18/vii 1908 from 10 a. m. to 12 midnight, 

 which gave the result, that the time for highwater and lowwater was 

 exactly the same at both places, whilst the difference in the height 

 of the tidal wave at Maroussia amounted to 131 cm. and in Danmarks 

 Havn to 137 cm. 



