Account of the operations of the Great trigonometrical survey of India Volume 3

9781235925580: Account of the operations of the Great trigonometrical survey of India Volume 3

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 Excerpt: ...conducted a secondary scries, with a 14-inch theodolite, from the principal stations of Kasáoli and Bárádevi, up the valley of the Sutlej, through Eámpúr, Chini, Shipki and Dankar, and thence through Spiti, across the Kunzam pass as far as the Bára Lâcha pass which leads from the British district of Lahaol into Ladák. The triangulation is 240 miles in length, comprising 300 first and second class triangles. The stations, of which there were fifty-six, were mostly situated on very high elevations: the heights of the stations between Eámpúr and Chini varied from 12,000 to 14,000 feet above the level of the sea; those between Chini and Bára Lâcha from 14,000 to nearly 19,000 feet, twelve of the stations being upwards of 17,500 feet high, and the highest station visited being 18,900 feet. The severity of the climate and the rarefied condition of the atmosphere at such great elevations, as well as the difficulty and risk attending their ascent, rendered these operations, an undertaking of the most arduous character, and its successful completion reflects great credit on Mr. Keelan's talents and endurance. In 1851, Mr. J. Mulheran carried a chain of triangles, with a 14-inch theodolite, from Cherú in Mandi, through Kúllú across the Rotang pass to Kuaring near Tandi, and thence up the Bhága valley to the Bára Lâcha pass in Lahaol, where a connection was formed with Mr. Keelan's work. This triangulation extends over a distance of 100 miles and comprises 113 first and second class triangles. After effecting a junction with the Sutlej triangulation, Mr. Mulheran continued his series down the valley of the Chandra Bhága as far as Triloknáth and thence carried it over th...

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