323 
1909-10.] Current Observations in Loch Carry. 
give the principal deep-water observations. Little conclusion can be drawn 
from them, save that currents do exist at the bottom of the loch, and that 
they are at times of considerable strength. When the currents are strong 
they appear to be confused in direction, and are probably more of the 
nature of eddies. The slower currents appear to be steadier, and to be in 
the same direction as the surface currents. 
Considerable stress has been laid on the variability of the direction of 
the currents, but it must not be forgotten that in certain conditions — 
continuous moderate winds — the currents may be very uniform. In all 
the observations shown in figs. 2 to 6 there was considerable uniformity. 
For example, on 17th August, at 50 feet, in an observation lasting for 
thirty minutes, there were fourteen indications of direction, and the varia- 
tion in the direction of the current was only 10°. But even in this case, 
when the observation at 50 feet was repeated three hours later, and when 
eight indications of direction were obtained, with again a variation in 
direction of 10°, the mean direction of the current had varied from W. to 
N. 60° W. ; the velocity of the current had also fallen from 11*9 to 6 '5 cm. 
per second. 
The variability of the strength of the current was almost as marked as 
the variability in its direction ; e.g., determinations at 40 feet on 18th August 
gave respectively 1*3, 1*9, and 3*8 cm. seconds for the velocity; at 200 feet 
on 6th September, *8 and 3 0 cm. seconds ; and at 200 feet on 4th September, 
11, 2 -5, and 4*3 cm. seconds. 
The value and interest of the observations would have been greatly 
increased had it been possible to observe simultaneously with two or more 
current meters. It would have then been possible to follow more closely 
the changes in the direction and in the velocity of the currents. On 
several occasions doubts arose as to whether some of the variations 
observed were not instrumental, and doubts of this sort would have been 
put at rest if a second current meter had been available for control observa- 
tions. It is to be hoped that more elaborate observations will be made on 
a future occasion. 
(. Issued separately March 8, 1910.) 
