MAGNETIC SURVEY OF TASMANIA. 91 
The prevailing rocks are indurated sandstones, quartzites, 
Inicaceous and talcose schists; they are usually classed as of 
pre-Cambrian age. 
. Aztmuths—N.E. corner of Schooner Bay (see sketch map 
figure II., plate IV.), a, 220° 30' 56’! Cairn on Balmoral 
Hill, B, 275° 59' 56". 
Magnetic station from M.S. mark.—Distance, 51-0 feet ; 
azimuth, 227° 53° 51’. | 
Directions for finding M.S. mark.—In the solid rock. On 
the west of Schooner Bay there are three well-marked ridges. 
‘The mark is on the middie one, near the medial line of the 
ridge, and at a height of about 27 feet above sea-levei. 
Station.—Sorell. Lat. 42° 47’ 38”. Long. 9h. 50m. 12°8s. | 
OST Teg 7 aR REI VCS RE TO ERC 
Date. | Time. Eismeni. 
| 
i 
tt as 
Feb. ef) 
15 | 2°50-3°8 p.m. 
Declination | 10° 1 36” E. 
14 
| 
Y tege 11°55 Bendy ee, 
; ¢ Force * 2034 
15 Deflection 4°10-5°40 p.m. erage 
14. | 10-10°35 a.m. I ae I 
| 10° 40-11-10 a.m. Is a ee 
The underlying rock is mudstone of Permo-Carboniferous 
age. 
Azmuths—Cairm on Mt. Rumney, A, 45° 32' 40’ 
Right panel post on further (south) side of Bellerive-Sorell 
road, b, about 304° 18' 
_Magnetic statzon from M.S. mark.—Distance, 139-7 feet; 
azimuth, 243° 18' 55’’. 
Directions far findmg M.S. mark.—Buried, Proceed from 
Bellerive towards Sorell, along the main road. At a point 
‘36 of a mile beyond the llth milestone a byercad 
branches off to the left, leading to Mr. Findley’s house. 
From the centre of the main road, along the middle of the 
bye-road, measure a distance 293 feet 6 inches ; then measure 
a distance 47 feet 7 inches exactly perpendicular to the bye 
road towards the right (northeast). The point so found 
is at the M.S. mark. A and } above will assist in exactly 
identifying the site. 
