236 PROCEEDINGS OF SECTION A. 
that the measured length of the Longford base was found to differ 
only 3} inches from that derived through the triangulation from 
the original base. The principal triangles of this system are very 
well conditioned ; but the same cannot be said of those by which 
connection is made with the bases. A large number of other 
triangles were observed with the same instrument, the error of 
close generally not exceeding 2 seconds, and at every principal 
station angles of elevation and depression were observed for 
determining the heights. 
The datum for the calcuiation of positions is at Hobart, the 
latitude and azimuth at this point being determined by observa- 
tions of o Octantis, and by observations of a number of other 
circumpolar stars at greatest elongations. At four other stations 
the latitudes and azimuths were determined simultaneously by 
elongation observations, the differences between the observed and 
geodetic results being as follows :— 
Station, teal |) eee 
DEOMEMABY?  <..5.0.secsiascsccsiseoeeceens 42 42 38°8 42 42 38°27 | — 0°5 
Browne Mountain, Jace seciemeriersacene 42°36) Tl 42 35 48°67 | — 19°0 
Alem Viounibalneecnereeeecrccrscnecsces 42 14 28°9 42 14 7:43 | — 2ilk5 
MoMertSmB liz c-cacccsenmecerenetencncs 41 56 18:2 4456 P37 —= 7A 
° Astronomical Geodeti Diff 
Lines. He yp Sotba rs [simu 
° , u” ° ! uw u 
Dromedary—Brown Mountain 69 23 19°4 69 23 30°8 | + 114 
Brown Mountain—TableMountain| 321 30 11°8 SyAl GOesBIe, | + 21°4 
Table Mountain—Brown Mountain| 141 46 13°2 14] 46 21:4 | + 8:2 
Miller’s Bluff—Table Mountain ...| 184 52 21:0 184 52 35°5 | + 14°5 
The method of latitude determination was not the most 
satisfactory, but modification of the results on that account would 
necessarily be small as compared with the above differences. It 
would thus appear that either the elements of the earth’s figure 
