GARDEN GEOMETRY 



413 



will give the position for the entering angle, as shown in 

 the illustration, (Fig. VIII). 



Joining Curves. When a curve forming part of a 

 circle has to be joined to a straight line, the centre of the 

 curve must lie upon a line at right angles to the other 

 line at the point where the curve is to start. When two 



Fig. IX 



curves of different radii have to join to form one con- 

 tinuous line, they must have a common tangent at the 

 point of junction, and thus may be considered as a double 

 case of that first dealt with. This applies whether the 

 two component curves are reversed in direction or not, 

 as will be seen in Figure IX. 



Fig. X 



Fig. XI 



Diamonds. These may be described as two equilateral 

 triangles with their bases coinciding; or, if a longer diamond 

 is required, the triangles must be of isosceles type, set 



