PLANE TABLE SURVEYING. 
105 
For further information on this subject, see a pamphlet, ‘On the 
Station Pointer,’ published by the Admiralty, and sold by J. D. Potter, 
31, Poultry, E.C. 
(4.) Orienting and fixing by the Compass .—Set up the table over the 
station X to be fixed, represented by x on the board (Fig. 7, p. 105); place 
the edge of the compass-box against a line drawn on the paper where the 
Fig. 7. 
needle pointed to north at one of the previous stations, unclamp the 
table, and turn it about until the needle again points to north. Clamp 
the table, which will then be oriented. Stick in a pin at a. Place the 
fiducial edge of the ruler against it, and turn it until the sights point 
to A on the ground; draw a line towards you by the ruler, and the 
desired point will be somewhere on this line. 
Stick a pin in at b, and with the fiducial edge of the ruler against it, 
turn the sights on B on the ground, draw a line towards you by the 
ruler, and the intersection with the line drawn from a will be x, the point 
desired. Using C in the same way will test the accuracy of the work. 
Shifting the Paper .—When one sheet is full and it becomes necessary to 
replace it by a new one, to continue the survey, it may be done in the 
following manner:—Draw a line through the farthest point fixed from 
