238 
A VOYAGE TO 
[East Coast. 
This position of Cattle Point, being reduced to the entrance of 
Port Jackson, will be for the 
Flag staff on the south head, latitude 33" 51^' south, 
longitude 151 i6|- east. 
Ramsden's universal theodolite was set up at the observatory, 
and intended to be used as a transit instrument; but from the 
unfavourable state of the weather and my numerous occupations, it 
was not adjusted to the meridian ; and the rates of the time keepers 
were therefore deduced from equal altitudes, taken with a sextant 
and artificial horizon in the usual way. Their errors from mean 
Greenwich time, at noon there July 18, and the mean rates of going 
in the last fifteen days, which were selected as the best, were as 
under : 
Earnshaw's No. 543, slow o h 16' 39" ,72 and losing S",6$ per day. 
520, - 1 18 53,00 - - - 19,52 
The longitude of Cattle Point, given by the time keepers with 
the Kanguroo-Island rates on May 10th, the first day of observation 
after our arrival, was by No. 543 - 151 0 31' 21" 
520 - 151 26 49 east. 
The mean is 17' 16" more than deduced from the lunar observations; 
and when rates are used equally accelerating from those at Kan- 
guroo Island, to what were found on first arriving at Port Jackson, 
the longitude by the time keepers would still be 14' 5 7", 4 to the east ; 
so that they appear to have gone less regularly during this passage 
than before. In fixing the longitudes of places between the two 
stations, the time keepers with their accelerated rates have been 
used; and the error of 14' 57",4 has been corrected by quantities 
proportionate to the times of observation, between April 6 at Kan- 
guroo Island, and May 9 at Port Jackson. 
The mean dip of the south end of the needle at 
Cattle Point was - 62052' 
Sydney to be 151° 12' 45" east of Greenwich; not differing more than a minute of lon- 
gitude from the above forty-four sets of corrected lunar observations. 
