6 
Lieutenant Foster’s account of 
The number of vibrations made by the pendulum in 24 
hours reduced to the level of the sea, in vacuo and at a deter- 
minate temperature, were computed by the methods detailed 
in Captain Kater’s paper before referred to. 
The second experiment marked (No. II.) was made at 
Port Bowen, on the eastern side of Prince Regent’s Inlet, 
where the ships passed the winter of 1824-25. 
The observatory house, prepared in frame at Deptford, 
having double walls and roofs, three inches apart, was 
erected early in October on the north side of the harbour, 
upwards of a hundred feet above the level of the sea, on a 
bed of secondary limestone, of which this place is composed ; 
the upper stratum consisted of small loose stones, that could 
only be removed to the depth of a few inches, below which, 
it was frozen so hard, that little impression could be made by 
the action of crows and pickaxes. 
The high table land, which characterises this coast, rises 
directly from the sea, on the south side of the harbour, to the 
height of between six and seven hundred feet ; the upper 
part, presents a perpendicular cliff of one or two hundred 
feet, exhibiting alternate black and white horizontal stratifi- 
cations of secondary limestone ; it is also deeply excavated 
in a variety of places by the action of the weather on its less 
durable parts, thus giving to its outline the appearance of 
ruined towers and other ancient edifices. The debris, which 
has fallen from the upper part of the rock, has formed a 
steep shelving bank or “ talus” along its base, except at 
those places where its outline is intersected by ravines, and 
here, projecting points are formed of the materials brought 
down by the melting of the winter’s snow. 
To the eastward, at the head of Port Bowen, there is an 
