140 GARDEN PLANNING 



US but little. The eye is the better guide, 

 and a length of rope an excellent help when 

 marking out the ground. The rope may be 

 laid along the proposed route of a curved path, 

 and its perspective appearance noted. If the 

 curve fails to satisfy the eye the rope can 

 be moved and rearranged until a good result 

 is obtained. 



All curves which are parts of circles are 

 easily described with the help of a cord and 

 centre peg. 



When setting out curves the course of which 

 has first been laid down on the plan the method 

 of offsets is the easiest. (See Fig. 30.) 



This is sufficiently explained in the illus- 

 tration, where a boundary fence is the datum 

 line. When the curve passes over an open 

 space a special datum line must be laid down, 

 either by the use of a stretched cord or a row 

 of pegs sighted into line. 



