PREPARATION OF THE DESIGN 97 



DIAGRAM 28. 



be had without having to survey it. The bill of 

 sale usually has one attached. Large old places are 

 always on the ordnance map, and for alterations the 

 latter is most useful as it supplies the boundaries 

 and main features while small ones can be filled 

 in by tape measure. The ordnance is also useful 

 in that it shows the ownership of fences which are 

 marked T on the side to which the fence belongs. 

 In any case the plan is usually on too small a 

 scale for working on. There are two simple 

 methods of enlarging. By means of the scale 

 supplied with the plan the area can be surveyed 

 in triangles as though it were the actual ground, 

 and when the dimensions are all secured the plan 

 is worked out as from a survey of one's own to 

 any desired scale. This is certainly the simplest 

 method when the area is mostly composed of 

 straight lines. Where curves are numerous and 

 much offset work would be required, the better 

 way is to rule out the plan supplied into squares, 

 say of 20 feet each way. Rule out a sheet 

 of paper into squares representing 20 ft. on the 

 new scale, and copy square for square. For a 

 large area the squares are best numbered along 



