SECOND REPORT ON THE DEEP CURRENTS 
OF THE NORTH SEA 
AS ASCERTAINED BY MEANS OF DRIFT BOTTLES. 
By CAPTAIN, C. H. BROWN 
(Of the School of Navigation), Royal Technical College, Glasgow. 
CONTENT S:. 
PAGE, 
1. Additional Bottles recovered from the First See tue 3 
2. The Second Experiment, : ; : 4 
3. The Western Areas, . ; 5 
4. The Long Distance Drifts, : 6 
5. Summary, : 7 
(With Three Charts.) 
The results of our first experiment with drift bottles for the 
purpose of determining the direction and velocity of the deep 
currents were published in 1909, in the Fourth Report (Northern 
Area). 
During the period between June, 1906, and September, 1907, 
1012 bottles were put away at different times and positions in the 
North Sea, from the “ Goldseeker,’”’ and at the time of closing the 
Report in January, 1909, 20 per cent. of them had been found and 
returned to us. Since then 116 additional bottles have come to 
hand, so that 312 im all have now (October, 1913) been accounted 
for. 
These additional bottom drifts were treated in the same way as 
the others, namely, a note was made of the area or areas through 
which each trawled bottle had apparently drifted by drawing a 
straight. line between the position where it was put away and the 
position where it was picked up. Then all the drifts through each 
area were tabulated, the mileage reduced to a common term of 100 
days (100 being selected for convenience), and the resultant 
direction and velocity through each area calculated. The several 
local resultants thus obtained having been projected on a chart, a 
few curved resultants grouped them together and gave an 
indication of the general trend of the bottom currents. 
On ADDITIONAL BOTTLES RECOVERED FROM THE First EXPERIMENT. 
In Table II. under subhead (a) is given a summary of the results 
previously obtained from the trawled bottles, and for comparative 
purposes under subhead (8) is given a summary of the results 
obtained from the trawled bottles recovered since the last Report was 
completed. It will be observed that on the whole the several 
directions are in fair agreement, and that wherever there is ia big 
difference in direction between (A) and (s) it is accompanied by a 
very short drift. But the mean rate of drift deduced from all the 
(2945). Wet. 3687/83—8/1914—H. & S, Ltd.—500, 
