( 457 ) 
IJ. Mean Errors. 
7 : South- | WEE] 
Nature of the errors. : __ | Coast of Remarks. 
| Sumatra | 
| Sumatra | 
In the determination of the | | | 
geographical latitude | 1) 0.21 0".35 | (1) For the orientation of 
In the determination of the{ “| ; | | the nets. 
azimuth of a night signal | OEZ OL 
(2) Determination derived 
In the azimuth of the 1st side, in from 37 closing errors 
so far as they arise from errors | 4 (see appendix). 
of the base-net. | = 0.85 
| (3) Determination derived 
In the angles adjusted at the from 73 closing errors. 
station (weight 12) ; 
(4) If we consider only the 
a from the results of the ad- | 10 triangles’), which 
justments at the station; 0.34 0.52 in the shortest way 
| (4) connect the first side 
b from the errors of closure of | with the connecting side, 
the triangles according to the we find: @0."59, 4 0".86, 
formula : | | 
= | | i (3) 
m= vier) | 07.64 | 0.96 
ve (2) | (4) 
Ill. Differences found in the adjustments. 
South West Coast | Diffe- 
Nature of the determination. meant 
rhea REWER TRE JD Sumatra | of Sumatra rence, 
Logarithm of the connecting 4,2335135.7 | 42334918 0 87.7 
side _ | 
Length » > > 17120.39 M | \7119.65 M. |0.74M. 
| | 
Azimuth » » » | 24799618 '.07 24799613"A3 |4!'. 94 
Geogr. latitude Gs. Talang 9°6'9". 312 S | 281.699 S. |0'.613 
| 
» » Bt. Gadang 
2°9'43" 1655 | 29949555 S. |0” .610 
Altitude above the sea level | 1375.5 M 1376.7 M. 1.2 M. 
Gg. Talang 
) ) » Bt. Gadang 281.8 M. | 2841 M. 2.3 M. 
| | 
From the triangulation of South Sumatra we derive: 
the geographical longitude of Gz Talang 5° 32’ 48/',525 | West of 
cs Hi se ,, Bt Gadang 5° 41’ 20’7,236 \ Batavia 
and from that of the West Coast of Sumatra: 
*) These triangles occur under the numbers 1, 2, 16, 17, 35, 36, 43, 50, 51 
and 52 on pp. 603 and 604 of Comptes Rendus des séances de la dixiéme conférence 
générale de l'Association Géodésique Internationale. 
