TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. Paull 
a large number of stars may have been observed and the results 
appear very concordant ; for, experience shows that there are 
always errors which are constant, or nearly so, for the same night, 
and which do not appear to be represented in the corrections 
computed and applied. Generally, signals were exchanged with 
Sydney on from three to five nights. 
LATITUDE OBSERVATIONS. 
The astronomical observations for latitude are made by the 
method of zenith pairs, the altazimuth being fitted also for use as 
a zenith telescope ; thus we have combined in the one instrument 
the means of determining latitude, time, astronomical azimuth, 
direction and elevation of surrounding points. Results of the 
observations for latitude at one station, Walgett, are given below. 
Latitude— Walgett. Zenith pairs. 
Observed by W. J. ConDER. 
“ Mean 
Date. Stars. Ohad Mean. Vn ie | v. ve, 
1884. 30° 1’ 30” 
18 Oct.| Cape 11,3441—11,400) 1°7 
Ne) 5 ae a rr 1128} 
20°; ” ” ” 2°93 506 
22 ;, ” ” ” 311 Sa0 
23 ” ” ” ” 1°55 PHT 2-236 4°72 
Ses », 11,428—11,448) 1:17 ae 
19 ,, » ” ” 0°73 ° 
20 ,, ” ” ” 2°90 
21 99 ” 99 ” 0°86 
22 5, ” ” ” 1°93 
23 ” ” ” ” 3°10 n06 BoC Aen 
24 ” ” a) ”9 2°18 1°84 2°646 4°87 
19 ,, ” ” ” 151 
20 9 99 99 ” 2:97 
PAN oe ” ” ” 1°43 onic 
22 ,, ” ” ” 2°26 Ade 
23 ,, ”9 ” ” 164 90 
24 ” ” ” ” STF 1°86 2°646 4:92 
VO); », 11,476 —11,539| 2°94 ak 
20S, ’ ” ” 3°58 ace 
215; ” ” 2 2°54 
22s ” ” ” Ze 5 
23 ;, ” ” ” 2°88 an male 
2b 5 ” ” ”) 2°35 2°88 | 2:449 7°05 
OR. 3, 11,490—11,508} 0-25 ad e 
20 ,, ” ” ” 2°08 | 
74 l ”» ” ” 1:07 
