An Underground Traverse. 



(5) Gives the following method:— (square section paper.) 

 MAIN REEF WEST DRIVE. 



413 



The following explanation is given : " The first line on the 

 co-ordinate sheet is the direction of 1127 M to 1128 M — 180 degs. 



" To this you add the plus angle and subtract the minus angle 

 as read underground. If instrument is out of adjustment and 

 readings do not add to 360 degrees, take mean of readings and 

 place in first column as direction of 11 28 M to 11 29. 



" Calculate horizontal distance, and also place in first column. 



