False Bay.-] TERRA AUSTRALIA 41 
on that day ; and their respective errors were deduced by allowing 1801 - 
' J <-> November. 
i h 13' 40", 47 to be the longitude in time of Simon's Bay.* Sunday 1, 
Earnshaw's No. 543, slower than 
mean Greenwich time, at noon h , „ n 
there Nov. 1, - - o 14 35,33 and losing 5-33 
No. 520, - - 34 - - 1 5 8 4 
Arnold's No. 176, - - 50 59,29 - - 8,96 
No. 82, - - 
No. 1735, watch, faster 21 20,03 - - 17,27 
The watch was intended to be taken up rivers, and to such 
places as the ship did not go ; and in order to gain some knowledge 
of its probable performance, I wore it five days in the pocket. Its 
rate of losing during that time, was from n",59to 8",79 per day; 
so that upon the average, it lost 7" less in the pocket than when in 
a fixed situation ; for the above rate of 17^,37 was what it kept in 
the box, during the last three days. Arnold's No. 82 altered its 
rate on the last day, from 2"98 to i'i8",6'8, without any apparent 
cause ; no rate could therefore be fixed for it, with any probability 
of its being kept. Of the excellent watch No. 465 of Earnshaw, 
being Mr. Crosley's private property, we were deprived at the same 
time with the astronomer ; he also took with him the reflecting 
circle, No. 74 of Troughton, both of which I considered to be an 
addition to our loss. 
So soon as the corresponding altitudes of Sunday afternoon 
were obtained, I took on board the time keepers and instruments, 
with the tents and observatory. The ship was then ready for sea ; 
but the wind blew a gale from the south-eastward, which continued 
until Tuesday. It then fell calm, and we unmoored ; but before get- Tuesdays, 
ting under way, the same wind again set in, and obliged us to drop 
a second anchor. 
*Tn 17G3, Mr. Mason determined the longitude of his observatory in Cape Town, 
from the transit of Venus, to be 18° 23' 7" east ; and the difference of longitude from 
thence to Simon's Bay, by the Dutch survey, is 2' 00" east. 
