( 570) 



the principal part, we have thought best for this purpose to compose 

 for the successive full moon-hours I he current- values as they follow 

 b\ interpolation from the different diagrams. The averages thus obtained 

 have been combined in new diagrams, which are represented on the 

 plate, in the last column of figures, and that by black curved lines. 



In order to complete the matter and to allow comparisons, in the 

 same way average diagrams have been derived from the observations 

 made in the past year at H2 (see above) and represented in the same 

 figures on the plate by black-and-white curves. 



The arrows drawn in these figures indicate: in the central dia- 

 grams the direction of the current at the moon's transit, in the 

 progressive diagrams the total residual current during a half moon-day. 



A comparison of the average current-diagrams for various depths 

 or also of the newer with the older ones might give rise to all 

 kinds of remarks. With a view to the small number of data, how- 

 ever, on which the diagrams are based, it would perhaps be incon- 

 siderate lo mention all of them here. We therefore confine ourselves 

 to what follows. 



Difference in Phase of the tide at different depths. 



August 1^05 -May 190G 



August — November 1904 



20 M.— 5 M. 35 M.— 20 M. 20 M —70 VI. 30 M.— 20 M 



