An Underground Traverse. 



409 



This is systematic, but lias weak points, in the writer's opinion. 

 The angle measured is only extracted once from the field book ; the 

 angle of direction (or bearing) is only taken down once ; the addition 

 of co-ordinates is only effected once. 



(3) confuses a calculation with the record of results obtained. 

 In other words, this is no form of calculation, and cannot be 

 criticised as such. As a form of record it contains too much ; no 

 practical good can come from laboriously copying out forms of 

 logarithms. The plotted traverse is useful, and gives a finished 

 record of the detail sketches made in the field book. 



