APRIL 7, 1904] 
INIA T ORE 
547 
distant more than a mile from the lower end, and more 
than two miles from the upper end. The bottom falls below 
the 300 feet level in two basins, the larger extending from 
about two miles from the lower end for a distance of 73 
water in the loch occupying the wider southern portion, 
where, about 3} miles from the lower end, there is a small 
area exceeding 500 feet in depth. The areas between the 
contour-lines, and the percentages, are :— 
Feet Acres Per cent. 
Ry L nan Eun 
ry 
oO 
° 
E upraig Yalica 
Y cK 
L.Choin’€” 6, 
= 2n5 cBlair Atholl 
LTummel 
tum mel 
Sron 
eur 
. ch OR 
res ch Ranno 
Laidon 94, 
< 
Fe, 
pe 
1 L.BG 
vi 
Glen yor 
: Tiles Z.lyon = Lnalairige 49 Lfreuchié 
2 ott i 
Killin. 
L Breaclaich, 
Earn 
Schechrnich 
daqg vad 
0 to 100 
100 ,, 200 
200 ,, 30G 
300 ;, 400 476 
400 ,, 500 474 
more than 500 58 
1575 34 
1160 2 
875 19 
104 
more than I 
4618 100 
Loch 
widest and 
eastern half, 
Rannoch is 
deepest in the 
narrowing and shallowing  to- 
wards the west. It consists of 
«one large deep basin, with two 
subsidiary small basins exceeding 
50 feet in depth near the west 
(upper) end, the maximum depths 
in which are 84 and 54 feet re- 
spectively. The t1oo-feet basin 
approaches close to the lower 
(east) end, extending for nearly 
seven miles up the loch, while the 
200-feet basin is six miles, and 
the 300-feet basin four miles in 
length, distant respectively about 
a Guarter of a mile and half a 
mile from the lower end. The 
Fic. 1.—Index Map of the Tay Basin. 
miles up the loch, and separated by a slight shoaling of 
the water over an interval of a mile from the smaller 
basin, which is half a mile in length. The 4oo-feet basin 
lies in the northern half of the loch, approaching to within 
less than four miles from the lower end, and is 3} miles 
in length, while the deepest part of the 
loch (exceeding 500 feet) is situated 
about 53 miles from the lower end, 
between Skiag on the south and 
Cragganruar on the north, the maxi- 
mum depth occurring (roughly) about 
one-third of the length of the loch from 
the lower end. A view of Loch Tay, 
as seen from Kenmore Bridge, is shown 
in Fig. 2. The ateas between the con- 
secutive contour lines, and the per- 
centages to the total area of the loch, 
are :— 
Feet Acres Per cent. 
0 to 100 1972 303 
100 ,, 200 153 34 
200 ,, 300 1390 21 
300 ,, 400 1017 153 
400 ,, 500 600 
more than 500 9g less than 4 
6520 100 
Loch Ericht is widest near the lower 
(south-western) end, narrowing towards 
the upper end. A constriction in the 
outline of the loch near Loch Ericht 
Lodge, about 43 miles from the upper 
end, cuts it into two deep basins, but, 
though the width here is less than a 
quarter of a mile, the depth exceeds 100 
feet, so that the 1oo-feet basin is a con- 
tinuous area 133 miles in length, extending from less than 
half a mile from the lower to less than a mile from the 
upper end. The 200-feet and 300-feet basins are each divided 
into two parts by the constriction referred to, the larger 
part in each case being found in the southern portion of the 
loch. The greatest depth observed in the portion of the 
loch to the north of the constriction is 314 feet, the deepest 
NO. 1797, VOL. 69] 
30 Eng. Miles 
bottom sinks in three places along 
the central axis of the loch below 
the 4oo-feet level, the easternmost 
basin being the largest and 
deepest, the maximum depth of the loch (440 feet) having 
been observed less than two miles from the lower end; the 
deepest soundings recorded in the other two small basins 
are 404 and 421 feet respectively. The areas between the 
contour-lines, and the percentages, are :— 
Fic. 2.—Loch Tay. 
Feet Acres Per cent. 
© to 100 ROGOME fey eee) ag. 41 
100 ,, 200 (yy ae eS: 19 
200 ,, 300 ROMMeS feted iene 20 
300,,, 400... 875 ss ooaliens 19 
morethan4goo ... ... ... 65 ..more than 
A717 100 
