OF THE UNITED STATES, 401 



tiioiisand metres, and between Cli and Vr, Plate IX. The 

 Jirst triangles lie upon Ihe points W and Cr. In the th.st, all 

 three angles were measured, and W ibrnied of course (he 

 main point. In the second, the angle at Qli could not be 

 measured, on account of a near wood which hid the whole 

 mountain upon vvhicli Cr was ; while a high signal in Ch was 

 distinctly observable from Cr. From the next point. BN, all 

 the foregoing were oI)scrvable, and vice versa. This gave 

 occasion to bring, upon the line F and BM, the results of 

 both into comparison, where from tlirec triangles, of which 

 all three angles were measured, and three in which two had 

 only two angles measured, the two results were, — through 

 W=i.T.508,S8 metres, and through C7-=li5 .508,8(5 metres. 



In the triangles, the sum of three angles, which I am un- 

 able to state from recollection, was satisfactory. I had not 

 yet all the angles measm-ed in the complete systematical 

 order wliich I explained in treating of die two feet theodolite ; 

 because the great delays of all kinds which I experienced on 

 the first station, on which I combined (he method fust, had 

 occasioned me to leave it and be satisfied for the time with 

 the numljcr of angles I had in general. 



The triangulation being now continued through S/7, TN, 

 LS, WE, and EK, of which the stations TN" and LS could 

 not be observed for want of time, the verification base be- 

 tween WE and EPj was measured, and compared witli the 

 result brought from the first base by nine triangles, and the 

 coincidence proved as follows, from all the points named : — 



The distance from WE to EE was= 7753,81. met. 

 Witiiout using the triangle EE, LS, WE= 8.3 



EE,TN,WE= 90 



By actual mcasuremcnt,= 7753, 



This last number in the measurement was made a round 

 number, on account of a chain measurement made jirclini- 

 narily only, though twice, and within less than half a metre 

 in the results, being all the accuracy that can be expected liy 

 this method. 



