--------------------+--------------+--------------+------------------- |Lat. observed.|Lat. computed | Difference Point. | | from |computed-observed. | |Triangulation.| --------------------+--------------+--------------+------------------- West Peg, Muelih |24° 53′ 40″·3 |24° 53′ 36″·7 | − 3″·6 Base | | | | | | Beacon on Gebel Um |24° 20′ 56″·5 |24° 20′ 49″·2 | − 7″·3 Heshenib | | | | | | „ „ Hill near|23° 55′ 33″·2 |23° 55′ 30″·6 | − 2″·6 Gebel Selaia | | | | | | „ „ Berenice |23° 54′ 39″·5 |23° 54′ 40″·3 | − 0″·8 Temple | | | | | | „ „ Gimeida |22° 46′ 33″·2 |22° 46′ 29″·4 | − 3″·8 Hill | | | --------------------+--------------+--------------+------------------- =Azimuths= were determined in the usual manner[69] by elongations of close circumpolar stars, _Polaris_ or _51 Cephei_ being usually selected. The azimuth mark used was an ordinary Egyptian _shamadan_ (candlestick with spring feed) with a glass globe, placed at a distance of one to two kilometres, with its foot firmly bedded in sand and stones to prevent any motion. The azimuths observed at the different stations are shown in the following table:— ------------------------+----------------------+--------------------- Station of Observation.| Point to which | Azimuth observed. | Azimuth is given. | ------------------------+----------------------+--------------------- Peg at West end of |Peg east end of base |33° 30′ 6″ E. of N. Muelih Base | | | | Beacon on Gebel Um |Beacon on Gebel Hamata|45° 15′ 34″ E. of S. Heshenib | | | | „ „ Hill near | „ „ Abu Gurdi |25° 30′ 35″ N. of E. Gebel Selaia | | | | „ „ Berenice | „ „ Kalalat |61° 10′ 31″ W. of S. Temple | | | | „ „ Gimeida Hill | „ „ Hamra Dom | 6° 14′ 46″ E. of S. | | | | Centre of Halaib Fort | „ „ Elba |83° 25′ 0″ W. of S. ------------------------+----------------------+---------------------