A VOYAGE TO 
[South Coast. 
arithmetic progression from those of the Cape of Good Hope to the 
new ones of King George's Sound, the mean of Earnshaw's two time 
keepers will then differ only 8' 19" to the east in forty-four days. In 
fixing the position of places from Cape Leeuwin to the Sound, these 
accelerating rates have been used ; and the longitude has been fur- 
ther corrected by allowing an equal proportion of the error, 8' 19", 
according to the number of days after Nov. 1, when the last obser- 
vations were made at the Cape of Good Hope. In the Appendix, 
the nature of these corrections is more particularly explained. 
The height of the thermometer at the tents, as observed at 
noon, varied between 8o° and 64 0 . On board the ship, it never 
exceeded 70^°, nor was below 6o°. The range of the barometer 
was from 29,42 inches in a gale of wind from the westward, to 
30,28 inches in a moderate breeze from south-west. 0 , 
Mean Dip of the S. end of the needle, taken on shore, 64 1 
On board, upon the cabin table, - 64 52 
The increase being probably occasioned by the iron ballast in the 
bread room underneath. 
The Variation given by three compasses at the 
observatory was 6° as*' west, by Walker's 
meridional compass 5 0 25', and by the surveying 
theodolite 8° 17'; but upon the eastern part of 
the flat granite rock, on the south side of the 
sound, two theodolites gave only 4 0 1' west. On 
board the ship, at anchor off Point Possession, 
the variation from the three compasses on the 
binnacle, when the head was south-eastward, 
was 9 0 28' ; or, corrected to the meridian, 7 0 12' 
west. It seems not easy to say what ought to 
be considered as the true variation ; but the 
mean of the observations at the tents being 
6° 42', and on board the ship 7 0 12', I conceive it 
will not be far wrong if taken at - - j» 0 > wes t. 
