1892.] Address, 75 



triangulation in Burma along the North "West 

 Surveys. Karen hills. Observations were taken from 



nine principal stations, and the series was 

 extended over a direct distance of 45 miles, embracing an area of 900 

 square miles. The selection and completion of thirteen principal stations 

 in advance of the season's completed work will allow of the employment 

 of two observers during the current season, and the outturn of work will 

 be materially increased. 



During the year tidal observations were carried on at 17 stations on 



the coasts of India, Burma and Ceylon. The 

 Operations. observatories at Madras, Coconada and Chit- 



tagong were closed during the year, while 

 registrations were commenced at Trincomalee and Minicoy. 



The levelling operations of the year comprised three lines of double 

 levelling, namely from Rajkot to Dhasa and thence along the Bhavnagar- 

 Gondal railway line to Bhavnagar, from Sanosra station on the same 

 line to the Chachuda Temple near Salbet, and from Naydongri station 

 along the north-eastern division of the G. I. P. Railway to Bhusawul, 

 and thence to Malkhed station on the Nagpur branch ; in all 425 linear 

 miles. 



Observations for latitude were carried out by Lieutenant Lenox- 



Conyngham, r. e., at seven stations, between 

 tions. " the parallels of 13° and 15°56', situated on the 



Madras Meridional Series of the Great Trigono- 

 metrical Survey. The instrument used was a new zenith telescope de- 

 signed for the application of Talcott's method — a system well known in 

 America but not previously tried in India. The results prove that this 

 instrument is very little inferior to the zenith sectox', while it is not 

 one-tenth of its weight. 



Photographs of the sun have been taken, as in former years, at 



the Trigonometrical Branch office, Dehra Dun, 



Branch Office. ou a ^ ^ a J s on wnic ^ *h e suri was visible. The 



computing section of this office has carried on 

 the work of the final reduction and publication of the results of the 

 operations of the Trigonometrical Survey. Volume XIV, containing 

 the details of the triangulation of the S. W. Quadrilateral, has been 

 completed, in addition to three synoptical volumes. Progress has also 

 been made with the volumes dealing with electro-telegraphic and tidal 

 operations. 



These have been carried on in Chittagong, Jalpaiguri, the Southern 



. Maratha country, Gujarat and Rajputana, Mer- 



veys p " gui, Baluchistan and the Himalayas. Forest 



Surveys were continuod in Hoshangabad, Cen- 



