experiments made with an invariable pendulum. 7 
extensive water course, and a low flat beach extending a 
quarter of a mile, and interrupting the high table land for 
the whole of that space. The land on the north side of the 
harbour from the head of the Port to Stoney Island (which 
lies about ~ of a mile to the S. E. of the observatory), is similar 
in character to that already described on the south. From 
Stoney Island to the north point of entrance, the coast land is 
not above 200 feet high, but rises to the height of 900 feet 
at a little distance in the interior. 
The house was placed with its length at right angles to 
the meridian, and divided into two apartments ; one was 
10 feet square; the other was five feet wide, 10 feet long, 
and 10 feet high. For conducting the various observations 
in the winter, the former of these was lined with a thick 
woollen cloth called fearnought ; the floor boarded, and a 
stove placed in it ; the latter, being for the use of the transit 
instrument, had a slit 18 inches wide cut through the walls 
and roof, and a large stone placed on the top of a cask filled 
with sand, formed the pedestal for the instrument. 
Previous to the commencement of the experiments with 
the pendulum, it became necessary to remove the boarded 
floor, and block up the door opening into the room from the 
outside : the entrance now being through the slit into the 
transit room ; the door in the middle of the partition between 
the rooms was protected by screens of canvas and fearnought 
on each side. The surface of the ground was then cleared 
away to as great a depth as possible, and large flat stones 
filled in with sand, formed the foundation for the supports of 
the pendulum and clock : care was also taken, that each 
support should stand on separate and unconnected stones ; 
