FOKESTBY WOKK 



upright on the peg at A (the level of the water in the 

 stream), and a reading is taken from the staff and booked. 

 Other intermediate readings may be also taken from the 

 same stand, if necessary. 



FIG. 11. 



The difference between the two readings shows the rise 

 or fall of the ground. The instrument is then moved 

 and set up again midway between the points B and C and 

 readings again taken, the rise and fall being added or 

 subtracted from the previous rise or fall. 



A simple and efficient method of booking is as follows : 



