GARDEN GEOMETRY 



409 



old, worn dinner-knife makes an excellent scriber for 

 scoring the turf. The following brief directions apply 

 to the principal figures used in ordinary garden practice. 

 Circles and Parts of Circles. Use a round peg and 

 drive it in firmly at the centre point. Make a simple 



Fig. I 



loop at the end of a length of cord (not a slip-knot, which 

 would bind on the peg), and drop it over the peg; meas- 

 ure off the desired radius along the cord, and secure the 

 knife handle to it with two half-hitches. Keep the cord 

 taut while scribing the circumference with the knife blade. 



Fig. II 



In setting out part of a circle when it is not possible 

 to use the centre peg, as, for instance, when the centre 

 falls within a building, describe the necessary Segment 

 the reverse way, as at A B in Figure II and stretch a 

 cord C D along the grass surface, making a tangent to 



