— RUN — RAPPORT 1905—06 ANNEXE C 
considerations and experiments I conclude that the velocity of an uninjured trailer 
approximates closely to that of the water sourrounding it. The compass bearings 
are true, not magnetic. 
A coastal current runs in the first half of the year from west and south to 
east and north along the shores of Vlieland, Friesland, Holstem and Denmark. 
This had a velocity of about 1 mile a day at Texel Island in June 1905 and Ame- 
land in August; in January and February 1906 in the same places it had a 
velocity of 1!/s to 2 miles a day or more. This current certainly goes as a bot- 
tom current up to Amrum and the Sylt and propably to the Cattegat. Since the 
trailers which passed Texel in January reached Amrum before those (probably 
clogged) which had left Texel waters in the previous June, it would seem likely 
that it is essentially a winter and spring current, stopped or possibly reversed in 
the autumn; and this appears to agree with what we know of the Cattegat cur- 
rents. Up to 80 miles WNW. of Texel there is a corresponding ENE. current of 
1 to 14/2 miles a day in June (1905), but in July this appears to be replaced, by 
a NW. current, and in August there seems to have been, on the edge of the Oyster 
Ground, either slack water or a slight easterly drift. At 100 miles W. by N. of 
Texel Island, in lat. 53°25’ long. 2°40’, the water seems to have been stagnant or 
eddying in June, with a northerly or westerly drift in August. No trailers of 
Series B have been found south of lat. 53° or W. of long. 2°. 
In November—December 1905 the whole of the water from Smith’s Knoll 
to Ymuiden, was streaming towards the mouth of the Skager Rak with a velocity 
of a mile a day. From the Brown Ridges to Ymuiden the drifters were mostly 
cast on the shores of Holland and its islands, or swept on past Ameland into the 
more rapid coastal stream above described. Trailers put in in November between 
Brown Ridges and Smith’s Knoll were recovered in February and March on the 
Oyster Ground NE. of their first position, but the few intermediate positions recor- 
ded indicate a N. by W. direction till the middle of January, followed by an ENE. 
_ course in February and March, which may possibly be harmonized with the ENE. 
current found between parallels 53° and 54° in June. 
In November—December 1904 Series A showed from lat. 52°15’ long. 3° E. 
a tendency to radiate in all directions, though for short distances except between 
NNE. and NNW. Many trailers were picked up towards the British 20 fathom 
lme, but the principal drift was at about a mile a day to the NNW. past Smith’s 
Knoll, and in intermediate directions between this and a NNE. drift of */4 mile to 
the Oyster Ground. In twelve months drifters of this series were reported in 
lat. 55°10’ N. long. 5°30’ E. — giving a minimum velocity of */2 mile a day to 
the N. by E. 
The three series together suggest a radiation on the bottom from the Channel 
VI 
