ON TEMPERATURE OBSERVATIONS IN LOCH EARN. 653 
Each of the sixteen portions of this diagram represents a longitudinal section of the loch, the depth 
2 greatly exaggerated. The blackened portion represents the space between 9° and 11° isotherms, 
ve hours, from | a.m. to 4 p.m. on 9th August. 
is diagram shows the variation in level of isotherms for 7°, 9°, 11°, 13°, 15°, and 17°, at Station I. 
the month, It differs from fig. 12 in that the relative position of the isotherms is shown, and 
scale is much greater. _ 
‘his shows, by means of the ordinary temperature-depth diagram, the distribution at each of the 
. shown by the observations made from noon to 1 p.m. on 8th August. The heavy black line is 
from the mean of these observations, and is supposed to represent the average distribution of 
ure over the whole loch. 
‘his diagram shows the density and viscosity distribution, corresponding to the average temperature 
n of the preceding diagram, 
The normal o(v) curve is shown by the irregular line, the biparabolic approximation by the 
EXPLANATION OF TABLES. 
I.—Current Observations. The first three columns give particulars of the date of the observa- 
depth at which they were made, and their duration. The fourth column gives actual directions 
in degrees West of North. A number prefixed to a direction indicates that there were two 
s of that direction, eg. 2 N. 270 W. means that the current-meter during the observation 
icated a current of N. 270° W., z.e. due Kast. The fifth column gives the average direction in 
Kast or West of North obtained from the various determinations of direction for each observation, 
olumin gives the velocity of the current in centimetres per second calculated from the calibration 
pplied with the instruments, 
te I1.—Temperature Observations. The date of the observations is shown in the margin. The 
bservation is shown at the top of each page, the hours being numbered consecutively from 1 to 24. 
rvations indicated as made at hour 1 were made during the hour from midnight to 1 a.m., those 
p 
TRANS. ROY. SOC. EDIN., VOL. XLVIII. PART III. (NO. 26). 95 
