A SMKVEY OF KSMAONi ^fi 



ftirement would nofc fenflbly vitiate the longitude of the place come tOj 

 which is the clement moft difficult to obtaino That error would affe£l^ 

 ihe latitude almofijexclufively^ and eveFy tyro in pradical aftronomy. 

 c?an Gorredt the latitude by celel^ial c^fervatiorv to uiihin a few fa- 

 thoms of the truth ; and thus it appears, that the limits of geographical 

 corre6lton, for which a means is offered by a knowledge of the poll*. 

 oons of peaks in the Himalaya chain, may be made to extend far bC" 

 ^jfondthe pointSj at whish the^ peaks theis^Jelves eeafe^to be vififelej 



Principles upon which the- Survey of Kemaon has been conduB.ed^ 



The bale is a line, nearly in the diref^ion of the meridian. The la- 

 titude of the ftation, at either extremity, halving beeo.carefuUy obferV" 

 ed with a circular inftrument,' and. the angle of an azimuth made by one 

 of them with a meridian paffing through the otherj^aftroQomically de«- 

 termined, the length of the baf:i v/as calculated with thofe data. The 

 ¥alue of the meridional degree is alTi/ned toht 6o,5op fathoms. 



From the bafe fo obfained, triangles were extended in the ufua! 

 manner, the three atigles be^ng- obferved inallpra^licable cafes. ThQ 

 fidejs of thefe were next computed in order, by plane trigonometry^^ 

 Xl,ie inftrument made ufe of bemg divided only to 20 of a degree. 



The latitudes of the feveral /ladons ware now caleulatedj; the angle 

 .of azimu'h being in all cafes either referred to the or^J^inal bafe, or 

 .aftronomically computed. In every inftaocc of (rial, the latitude com- 

 puted from the furvey agreed wich celeftial obfervation, fo neirly,.as 

 to leave it doubtful, which might be in error, 



2 G 



