OF THE UNITED STATES, lOa 



Tlirough W the result was=4a392,()3 metres. 



Throu2;Ii Cr the result was=4r23y i,fi4 



The othtr coincidences being equal to these, in general 

 it appeared to me evident, that in a()plying the method de- 

 scribed when treating of the two feet theodolite, in the angles 

 of the main triangles, I could reach the accuracy of less than 

 one second in the sum of the three angles, with full certainty 

 always, and that only one pair of direct and reversed oI)ser- 

 vations was fully sufficient to determine any near detail point ; 

 that it was therefore most advantageous to observe them in 

 this manner from any station where they would be visible, 

 as this gave a verification from different bases. 



The azimuths observed gave results equally satisfactory, 

 so far as they were calculated, but as their calculation was 

 not completed, when the work was interrupted, what had 

 been done was again cast away, as it did not present a final 

 result, and might, by being considered as such, ratlier mislead 

 than serve for any useful purpose. This was so much the 

 more proper, as they were all to be considered as merely 

 preliminary. 



I had built in Newark, in my garden, a small observatory 

 which could be determined from BN, and in which I intend- 

 ed to make a regular scries of latitude, longitude, and azimuth 

 observations, as staled above. 



It will easily be observed, in the sketch of the triangles, 

 which are the stations on which I observed any angle, the 

 lines of the triangles being there drawn full, while to the 

 points on which Iliad not observed, they are merely dotted. 

 The angles of elevation of the principal |)oints were taken 

 on all stations, so that their relative height can \>c calculated. 

 To reduce it to the level of the sea, I levelled actually from 

 the point N down to the water, this point being close to the 

 shore, in the narrows, upon the high eastern bank. 



The results of all that relates to this have not been calcu- 

 lated, as this could only take place after the calculatiori of the 

 distances. The geodcsital parts were of more importance 

 to obtain first, as they lay nearer to immediate use. 



