OCR Text |
Show NOTE. Tffi Anglos of the Triangulation were measured with, a seven- inch theodolite, by Draper. The instrument was scarcely competent to the work, from the tow power of its telescope, the groat distance between most of the atations, tbe mirage, and the almost constant haze that pervaded the atmosphere. Many repetitions of the readings were consequently necessary to secure the requisite accuracy in the result?. This wad peculiarly the case in obtaining the Azimuth of the Base Line, which was fixed by observations of the Polar Star, The work U believed to be sufficiently accurate to correct the detailed measurements, as well ai to form a basis upon which a triangulation may hereafter be extended over thb gra* t internal basin, should such a work ever be contemplated by the Government, The natural features of this desolate region, abounding ae It does in lofty eminences, widely separated by intervening level plain*, is admirably adapted to such an operation; although its execution could not but be attended with great labour and privation. Many of the deserts would furnish extended plains absolutely IOTCI, upon which a degree of the Meridian could be measured to great advantage. |