GBEAT TEIGONOMETBICAL SURVEY OF INDIA. 53 



three times as great as that of the Subansiri, and that the former 

 is much more likely to be the continuation of the Sanpo than the 

 latter. 



The secondary triaugulation in Burma consisted in 1876 of chains 

 projected from the Eastern Frontier Series in various directions, 

 one being from Myanong to Cape ISTegrais, (2) one from Prome to 

 Thayetmyo and Tonghu, and (4) a chain to meet (2) in the neighbour- 

 hood of Tonghu. The country through which these operations had to 

 be carried on was difficult, the hills being flat-topped, densely wooded, 

 and from their similarity difficult to distinguish apart. The 

 difficulty of obtaining labour, too, was considerable, as the Burmese 

 coolies strongly object to being absent from home for more than a 

 day or two. In the folio-wing season (1877) Mr. Beverley was 

 instructed to select suitable sites for two lofty beacons which it was 

 proposed to erect on the coast line abreast of the Krishna shoal, the 

 lighthouse on which had mysteriously disappeared, whether blown 

 over in a storm or demolished by the collision of a vessel was 

 unknown. Strenuous efforts were made to extend the triangulation 

 towards these beacons during the year 1878-79 ; but in conse- 

 quence of the great difficulties encountered, owing to the country 

 being quite uninhabited and covered with dense forest and jungle, 

 through which it was almost hopeless to attempt to cut openings 

 for the rays, the attempt to triangulate was abandoned, and instead 

 thereof a traverse survey was carried to the beacons along the 

 best paths that could be found. 



At the close of the season 1875-76 the line of principal triangula- 

 tion called the Eastern Frontier Series had been brought down to 

 the vicinity of Tavoy, whence, during 1876-77, it was carried 

 forward in all a distance of 92 miles, first by Mr. H. Beverley and 

 afterwards by Captain J. Hill, R.E., who assumed command. For 

 the extension of the triangulation southwards it was necessary, 

 during the ensuing season, to have a station on the group of 

 islands known as the Middle Moscos, and another on the Southern 

 Moscos. The country traversed on the mainland was very like that 

 of the previous season ; a thick impenetrable jungle, covering plain 

 and mountain alike, and offering great obstruction to the elephants, 

 which had often to be brought to the stations by tediously circuitous 

 routes. The trigonometrical measurements were advanced a distance 

 of 65 miles ; the position of the town of Tavoy was fixed, as well 

 as that of the " Three Pagodas," an important and well-known mark 



