26 
BATHYMETRICAL SURVEY OF 
This table shows that the average slope of the bottom is regular, the 
areas decreasing with increase of depth, and that the loch partakes of a 
flat-bottomed character, as evidenced by the comparatively large area of 
the lake-floor covered by more than 200 feet of water. 
Temperature Ohser rations . — Two series of temperatures were taken in 
Loch More, one towards the north-west end at 5.15 p.m. on September 5, 
and the other in the deepest part of the loch at 2 p.m. on September 6, 
with the following results : — 
1 
Depth in feet. 
1 
I. 1 
September 5, 190-2, 5.15 
p.m., near N.W. end 
in 101 feet. 
II. 
September 6, 1902, 2 p.m., 
deepest part of loch in 
294 feet. 
0 
54°-0 Fahr. 
54° -4 Fahr. 
20 
— 
54°-2 
n 
25 
53°-4 „ 
— 
50 
53°-5 „ 
i 53°-9 
)) 
100 ; 
50°-9 „ 
51°-2 
j) 
103 
50°-6 
106 
47°-3 
n 
112-5 
1 47°-3 
125 
! 
470.1 
) ) 
150 
1 46°-3 
)) 
200 
45°-9 
290 
450.7 
n 
These series show a total range in temperature of 8°*7 from surface to 
bottom in the middle of the loch, and of 3°‘l in the 100 feet of water 
towards the north-west end. In both series a fall exceeding 2J° was 
recorded between 50 and 100 feet, but the greatest fall observed was 
between 103 and 106 feet in the middle of the loch — -a fall of 3°*3 in the 
3 feet of water, or more than 1° Fahr. per foot of depth. The readings 
taken towards the north-west end are all slightly lower than those taken in 
the middle of the loch at corresponding depths. 
Seiches . — Seiches were observed on Loch More on September 2 and 5, 
1902, the amplitude in each case being about half an inch, but the period 
could not be accurately determined. The fundamental period was about 
eleven minutes. 
Loch na h-Ealaidh (see Plate VIII.). — Loch na h-Ealaidh is a small 
shallow basin at the north-west end of Loch More, the narrows between 
them being crossed by stepping-stones, and having a depth of 1 foot on 
the date of the survey. The loch is irregularly subcircular in outline, 
with a maximum diameter of less than half a mile, its waters covering 
an area of about 64 acres. The maximum depth of 8 feet was observed 
towards the north-west end, where the river an Earachd flows out, and 
the great majority of the soundings were taken in depths exceeding 5 feet. 
The volume of water is estimated at 13 million cubic feet, and the mean 
depth at 4| feet. The loch was surveyed on September 6, 1902, the 
