CHAP, v.] EXAMPLES OP IRREGULAR PLOTTING 141 



distant mountain-peak on an island or across a strait fronting 

 this portion of the coast, also fixed in the triangulation, and 

 observed from A and B, which are visible from one another. 



The intermediate stations D, E, F, G, H, and K, which are 

 so placed as to be visible from each other, may be fixed on the 

 side-shots and the calculated angles at C ; but, being very 

 close to one another as compared with the distance of C, 

 the calculated angles will be liable to error unless great care be 

 observed, and the errors, moreover, will be cumulative. In 

 such a case true bearings of C from the intermediate stations 

 are preferable to calculated angles, and are laid down as re- 

 versed bearings from C with the convergency applied. If C 

 is at such a distance from the coast-line in question that it 

 cannot be plotted on the sheet, the several distances A D, D E, 

 E F, etc., can be calculated and laid down on the side-shots. 



Example VIII. — Given two inaccessible and comparatively 

 distant objects, the distance between which is known either from 

 the chart or from some previous triangulation, the long side of a 

 small plan may be obtained from them as follows, with a degree of 

 accuracy jn-oportionate to the distance and direction in which 

 the distant objects lie relatively to the direction of the long side of 

 the plan. 



Fig. 31. 



A' 



In Fig. 31, A and B are theodolite stations at the extremes of 

 a small plan. C and D are two inaccessible points the distance 

 between which is known. Angles being observed at A and B, 



