[ $93 3 
Remarks on Major-General Roy's Account of the trigonome- 
trical Operation, from Page x xi. to Page 270. of this Volume . 
By Mr. Ifaae Dai by, 
P AGE 134. 1 . 2 o, See. The inclinations of the bafes with 
the meridians were determined by fpherical computation, 
and therefore can only be confidered as nearly true, 
P. 1 71. 1 . 6 . from bottom, for we have area in feet put we 
have log. area in feet, 
P« 173. in the VIII triangle, for 0,0 1 put 0,1. 
P. 174 . in the IX triangle, for 0.88 put 0.83. 
P. 175. in the XVII triangle, for 71855 put 71885, 
P. 177. This method of making the comparifon on a 
long diftance, when the meafured bafes are fhort, and nearly 
of the fame length, feems preferable to that of carrying 
the computation direCtly from one bafe to the other. Determi- 
nations of this kind, however, muft always be uncertain to 
particular limits on account of the inaccuracy of inftruments 
and obfervations combined with the unknown figure and dimen- 
fions of the earth. Was the earth a fphere of a known mag- 
nitude, the moft natural method of computation would have 
been by fpherical trigonometry, after the obferved angles had 
been corrected for that purpofe ; which method (fuppofing the 
angles wanted no correction, or each had been accurately ob- 
ferved) would fhew which bafe was meafured neareft the truth* 
Or the fame thing might alfo be obtained by plane trigonome- 
\ ol. LXXX. 4 H try, 
