Method of SencPRinie true eN orth or South, 
By J. S. Cuarp, District Surveyor. 
_ [Read before the Royal Society of N.S. W., 2 August, 1882.] 
Tus method is specially suited to this Colony and other places where 
asmuch as the 
k , and with their FitaPocotionl? as a centre two pen 
_ *or the southern hemisphere the radius of the outer fs corre- 
_ Spends in angle with the south polar distancé of «Octantis, and the 
radius of the i Aaa oa corresponds in angle with the g P.D. of 
Octantis, B. 
Owing to ike iaeioies | in right ascension between these stars, 
Viz, Thetis 49 minutes approximately, when the outer circle is 
Placed on ¢ Octantis and the inner one on Oct. B.A.C., 7020, care 
| exactly to the south 
a ree gan angle between tand any terrestrial object as 
the nt mark, the true peuing of the latter is ; determine en 
of th orenon of the lines is pointing to the south pole, the reading 
© altitude circle, minus refraction, gives at once the latitude. 
Sketch of the Lines of the Diaphragm when placed on the Stars. 
ec oN 
| 4 : es 
“SCs ae a 
f Pa 
a 
i w through inverting telescope. 
(©Octantis Go ie Corresponding vie and Oct. B.A.C. 
Tod the inn ite “rath revolves round the outer circle, 
a 
: fine thoy seen aay irrespective of the hour angle, the ~ 
‘pene and horizontal lines still points to the steep pole. 
e is the principle of the method. I will now p 
er more 
+h “hay to see that o Oct. precedes the other in its ‘path round - 
© pole, the intersection of the vertical and horizontal lines points 
ole. 
bg etailed information concerning the di mensions and 
Beg 
