403 SURVEY OF THE COAST 



The base between Ch and Yr had also been measured 

 twice with the chain carefully, and if I recollect right, there 

 was hardly three-tenths of a metre difference in the results. 

 As this base was intended for a standing one for the work in 

 genera], the neighbourhood of it was surveyed in detail pre- 

 viously, in order to lay it out in the most advantageous posi- 

 tion for the future accurate measurement, with the apparatus 

 described in its place. 



The base between WE and EE being intended, as has 

 been stated above, only for an early verification of the linear 

 unit of the work, in order to be enabled to begin the detail 

 surveys as soon as possible, would most likely not have been 

 remeasured, but another one, at a greater distance from the 

 first, substituted for it, in the continuation of the triangu- 

 lation. 



The chain with which they were measured was made pur- 

 posely, of links of a metre in length, which, as they do not 

 bend into all the small inequalities of the ground, are far pre- 

 ferable to small links. 



The coincidence of the two bases was, under these circum- 

 stances, of course above expectation, and as it gave such a 

 proof of the accuracy of what had been done, has brought it 

 far within the hmits of what it would in any suitable scale be 

 possible to show upon paper, it was of course considered suf- 

 ficient to serve to ground the detail surveys of tlie neighbour- 

 hood on the triangles executed from these, which are seen 

 in the sketcli. 



The point H was intended for the continuance of the sur- 

 vey to the east connected with W : the points Sp and B were 

 inteirded for the same purpose towards the south. 



The distance HF having been determined both through 

 W and through Cr, had given a coincidence sufficiently sa- 

 tisfactory for the few angles which it had been possible to 

 measure upon H from Cr and W, which would of course have 

 been repeated in the further operations, and corrected by 

 the observations on H itself 



