214 PROCEEDINGS OF SECTION A. 
Latitude— Walgett. Zenith pairs—continued. 
Date. Stars. Opened Mean. | Jn x A wv’. 
1884. 30m S04 
24Oct.| Cape 12,381—12,420) 2°87 BIN || PATA) | 2 7/40)7/ 85 72 
20 ,, meng oui 343) = 2 be Ue 
21 ,, ” 0 Op 1°88 
22 ” ” DD OD) 2°91 
23, he Pe 370) ee. he ees |i... 
24 ,, ‘5 Paar Dsl 2°85) || 2°236 6°37 ae | ay 
WB} an », lll—164 3°01 ae ae A or se 
24° Ap ne 1883 PPAlef |) die glet 3°07 14 02 
DAL me », 132—l164 DRY. nae BS ae was 
22 ” ” 2999 3°12 
23 sae cde tas AcOR. Ain me i 
Pan | os a AS eS 272 3:05 | 2:000 | 6:10 74 13)5) 
a1. 990-268 1977 tee. _ Pee |” ao. 
22 ,, ry) an SOD 2°66 
23 |, : rn 3:07) al ee ie i ioe aa 
DN b eee 2°87 2°69 | 2:000 5°38 38 14 
2, 5, 268—306 1°36 ae ae Aa as ae 
22 ” ” 2299 1°66 
5B i eens 222 |... ei 18 
24%, .. ssa 1:58 1°70 | 2°000 3°40 ‘61 coil 
21 ,, , 352—386 0-60 | ... i | 
22 ,, ” MD Pp 1°76 
23 ,, ae sa 1:85 | ... et a ef. 
D4 Rey me 0:50 | 1:18 | 2000 | 2:36 | 1:13 | 1:28 
22 |, » 6352—401 Tedesco. i. cae ek ene 
IE Ne 192 |... a On| sia ae 
OA |, NS 0-65 | 1°30] 1-732 | 2-25 | 1-01 | 1-02 
62°117 | 143-63 9:29 
PSI 
Tatitude; 302 153231") PE -12.0108- 
MICROMETER VALUES IN LATITUDE OBSERVATIONS. 
From the mode of observing it is to be noted that the accuracy 
of the latitude results depend, to a large extent, on the value of 
the micrometer screw, and, recognising this, it was asked some 
time back that observations might be made to re-determine the 
value, for verification of the adopted one which rested on measures 
made as long ago as in 1882. As micrometers are so generally 
used in astronomical work, as well as in other branches of physical 
science, and since they are too generally relied on as being 
