m% MEMOIR RELATIYE TO 



In the preceding diagram the ilation near PUibhU is reprefented hj F, 

 Jk B, C, are the fnowy peaks, Nos. XIII, XIX, XXV, refpe6Hvel>> i 

 JPJ, PB, PC, their diftacces from the flation; Pd, Pd', Pd'' their dif» 

 ferences of latitude, PN is a meridian paffing through the flation. 

 The things known are marked with a line (') the things required with 

 a cypher (o). 



CASE 2b, 



Is that mofl likely to occur in pradice, as it affords a means of cbm^ 

 puting the longitude of the Ilation from obfervations of a iingle known 



peaks 



It fuppofes ^o be known, the co- latitude of the peak, the co-latitude 

 cf the Itaticn, and the a-gle of pofuion at the latter ; to find the arch of 

 diftance, sod the angle Tiid^ by their meridians at the pole, or which 

 is the f me thing, their difference of longitude. 



The following are inflances, iu which I have computed the longitude 

 of places in RoMIcuni by this method. 



The fird fl^ation is a walled garden a little to the eaftward of the town 

 of Ca'jj)^Mr, four fnowy peaks were vilible and gave the longitude as 

 below :. 



o ^ /, 



LongHude of Casipar by No. XTT -c^ 78 48 64,8 E, 



X:!I = 78 48 62,3 



X!V ri: 7« J8 Sa.S 



XI =: 78 4" 5.1 8 



Mean LougUade ««*..•«*•...••<.•■> «se» «««• '^ -^^ ^4,1 



The longitude of Cds'ipur according to Mr. Burrow is 78^ 51 ' be* 

 ing 2 ' 6'^ more eafterly. But the longitudes given by Mr. Burrow 

 are deduced from aftronimical obfervation entirely, and he himfelf fug- 

 gells that fome of them may be as much as five minutes in error. 



