244 
BATHYMETEICAL SUKVEY OF 
On July 2, 1903,' the surface was 28-4 feet above sea-level, which is 
identical with the level found by the Ordnance Survey officers on July 19, 
1876. The temperature varied less than half a degree from surface to 
bottom. 
Loch of Asia (see Plate CIII.) is a small loch just south of the Loch of 
Ting wall, and the surroundings are similar, but the hills are lower, and 
there is no marginal flat. There is rock on the west side, towards the 
north ; on the east, where there is no beach, and the hill slopes steeply 
into the loch, no rock was seen. The burn flows southward about a mile 
into Clift’ sound, close by Scalloway. There is rock in the stream close 
below the loch. 
The loch is narrow and elongate from north to south, with a length of 
half a mile, and greatest breadth of one-eighth of a mile. It is very 
shallow, the greater part less than 6 feet deep, and a single sounding of 13 
feet near the north end. The mean depth is 5 feet, the area 32 acres, and 
the volume of water 7 millions of cubic feet. The level is barely 2 feet 
lower than the Loch of Tingwall, viz. 26*6 feet above seaJevel on July 2, 
1903, which is nearly identical with that (26’5 feet) determined by the 
Ordnance Survey on July 19, 1876. The drainage area, which includes 
the Loch of Tingwall, is nearly 2 square miles. 
Loch of Brow (see Plate CIV.) is a small triangular loch in Dunrossness, 
close to the east end of the Loch of Spiggie. The surrounding country is 
low, rising highest on the north. The loch measures half a mile long, by 
one-ninth of a mile broad near the east end. It is very shallow and almost 
flat-bottomed, with a maximum depth of 6 feet and a mean depth of 2J 
feet. It has an area of nearly 45 acres, and contains 5 millions of cubic 
feet of water. Two streams enter at the east end, the chief being the Burn 
of Hogarth, coming from the north, the area drained being a little over 
a square mile. The outflow to the Loch of Spiggie is across a flat boggy 
meadow, about one-eighth of a mile across. The level at the date of the 
survey (July 3, 1903) was the same as Loch Spiggie, viz. 4*0 feet above 
sea-level ; the Ordnance Survey officers found the level on September 1 9, 
1876, to be 3*5 feet above the sea. 
The surface temperature was 58°“5 Fahr. 
Loch of Spiggie (see Plate CIV.) is the only moderately large loch in 
the southern part of Mainland. It is approximately oblong in shape, and 
its long axis runs nearly north and south. The surrounding land is low, 
and there are a number of farms on the shores of the loch. At the north 
end are the Sands of Scousburgh. In length it is fourth among the lochs 
Surface 
55°-3 Fahr. 
10 feet 
25 „ 
55 ,, 
55°-0 
55°-0 
54°*9 
