THE SCOTS GARDENER 



But if none of these will do, run a line over by 

 guess, but if it miss (as no wonder), take notice of 

 your error at the end, by letting a perpendicular 

 fall on the determined poynt (by means of the 

 squair or cross), and the measure betwixt discovers 

 the error : then measure the length of your in- 

 tended walk or line, and, at the J thereof, set off 

 the fourth of your error ; at the middle the ; at 

 the f of the length, set off the f of your error ; this 

 will lead you straight to your purpose. 



Trigonometry will also solve this, if you could 

 work exactly; for here you have two sides and one 

 angle given you. 



If you have a given line, and desires to set off a 

 parallel from it, but cannot measure off freely at 

 both ends, there being trees, waters, hills, walls or 

 houses, obstructing, you may measure, squair or 

 perpendicular off at any part of the given line (that 

 is most convenient), so far as you mind to go with 

 your parallel, at, or upon which point, erect another 

 perpendicular to run backsight and foresight, the 

 which shall be exactly parallel to the given line, 

 as was required. 



Having given some directions for staking out 

 walks for planting, yet your avenues and walks 



U 



