1908-9.] Observations with a Current Meter in Loch Ness. 627 
may be due to this. The temperature was rapidly changing at the hour 
of observation, and, as already shown, the currents due to this cause may 
be of considerable amplitude. 
On 6th August a strong S.W. wind was blowing, and also on 8th and 
9th August. On 7th and 10th August the wind was of moderate strength, 
and possibly the strong currents observed are the result of the previous 
day’s storms. 
On 27th and 28tli August also the wind was very strong. The discon- 
tinuity in temperature was at this time at a depth of 125 feet to 150 feet. 
The only other days during this period on which the wind was of 
considerable strength and on which observations were made were 3rd and 
22nd August. On the 3rd no observations were made between 6 and 50 feet, 
but at 50 feet there was a current from N. 52 W. of 8 cm. secs. On the 
22nd there was at 15 feet a current of 2 2 cm. sec. from N. 60 E. ; 1*6 cm. 
secs, from N. 40 E. at 75 feet and 2 - 9 cm. secs, from N. 80 E. at 90 feet. 
This was after a week of prevailing N.E. winds, and the currents are 
probably due to the progress of a reversion of the temperature distribution 
from the N.E. to the S.W. type. On 21st August the currents were very 
undecided in direction. 
Frequently cross currents were observed at right angles to the direction 
of the wind, and during the strong S.W. winds on 3rd and 8th they were well 
marked, viz. : — 
On 3rd August 8'0 cm. sec. from N. 52 W. at 50 feet. 
On 8th August 9’7 cm. sec. from N. 42 W. at 15 feet. 
In fact, the observations on 8th August show directions at various 
depths all round the compass ; e.g. : — 
S. 88 W. near surface. 
N. 42 W. at 15 feet. 
S. 23 E. „ 30 „ 
N. 45 E. „ 60 „ 
On 28th August a high-current velocity of 15 2 cm. sec. was recorded at 
60 feet. Unfortunately on this occasion the compass needle was found to 
be off its pivot when the meter was brought to the surface, so that the 
direction of the current is uncertain. The observation is nevertheless 
interesting, as the velocity is the greatest recorded during this period at 
any depth with the exception of an observation on 4th August of 15*5 cm. 
sec. at 24 feet, and on 5th August 16’9 at 6 feet. 
A contrast between the observations on 5th August during a N.E. wind 
