C. Abbe on the Repsold Portable Circle, 215 
one, circle left, may therefore be expected to be affected with an 
accidental error of 
+0'"74 
/2 
and for one depenatng on vote pointings we have a probable 
accidental error, +0/"26. A latitude or time determination de- 
pending on two such zenith diseasines has accordingly the prob- 
able accidental error of observation, +0'"18. 
he influences of psig: clock correction, erste periodic 
that of division, still remain. "The latter have n ot, to m 
= -+0'"52; 
divided with the same machine used in div ing the small cir- 
der Breite Gradmessung,” and the “ Description de 1 
toire sree The combined influence’ of all rhe causes 
r hi : 
oo Nautica Almanag,. ier results ne 0 ee series 
leduced b 
Peters, is +59° 46’ 20’-02. Each of the following ie oe of » 
results from one observation consisting of eight pointings upon 
the respective stars. 
Zenith point of the circle ery Zenith point of the circle ae 
ona Mein Rees Men or, Mate Reig Meee 
i : 59 46 
i Be eames Pi ans! - re 9. a Min. oan orci 19 ‘4 a3} 201-86 
tinge se ae sso. #13 55 Bisa 
ee iu See oS Bkiae 
tie TEE B Blo mate, GEE Bl a 
5,8 Urs. Min. s p. -45 a0 131 88 hoo eons 0 Os Min. op. 45 sad io 3} 2088 : 
cbiinen 6 2 Hin actin meen e @ 8 Bla 
TeVingis 535 3e 3p gto e515 tiene sip Gy iz ape as 
“Virgie? 216 ie ia ti0 % er > ji is 1 eof? 
Mean of 8 pairs, 20 oa peer 20 08 
By reference to the Ertel circle, 46 20 02 
———— 
Difference, O° 
