68 GARDEN DESIGN 



be inspection chambers and other accessories of 

 drainage to note. If these are not yet fixed here 

 is a point on which architect and garden designer 

 may well consult, for the modern systems of 

 sanitation with their conspicuous iron inspection 

 lids and hideous ventilating shafts work havoc 

 in a garden scheme. With forethought the inspec- 

 tion chambers could be arranged so as to be set 

 in the paths, whereas more frequently it is the 

 other way about : the paths have to be made to 

 accommodate the drainage. 



A plan of the ground with the position of the 

 house and the levels can frequently be had 

 through the architect. Trees and other features 

 will have to be marked in. Where building 

 operations have ceased a survey generally has to 

 be undertaken. For plots under five acres a tape 

 measure and plenty of stakes is all the apparatus 

 required, and this is the only form of surveying 

 that will be described here in detail. 



The measurement of areas is always done in 

 triangles, a triangle being the simplest figure 

 enclosing space. The size of a triangle is known 

 by three sets of circumstances. Firstly by the 

 length of two of its sides and the size of the 

 angle between them ; secondly by the length of 

 one side, and the size of the angles made by 

 this side with the remaining two ; thirdly by the 

 length of the three sides. (See Diagram 17.) 

 The second method is mostly used for large sur- 



