11 Sept., 1916.] Apple Culture in Victoria. 



525 



position for (d) has been found, put in the two rows of pegs. A 

 square is then formed and the wire removed (/) (e), and when this 

 row is filled in the remaining ones may be dealt with similarly. 



Whenever the fence lines (AB) describe a true right angle no 

 square is required; simply allow 20 feet for the headlands, and distance 

 between the trees may be found by using the wire. 



Plate 10 shows method of finding a right angle without using the 

 square, and when there are no fence lines to describe it. This is 

 based on the 3, 4, and 5 principle on which the square is constructed. 



I 



^e tf' re Marked [verj BO Feet ^[^^ h ^ 



^il 



aJ 



k — CO' /^ 



--1 



Plate 10. — Method of finding a right angle without using a square. 



But a multiple of these numbers may be used in order to obtain greater 

 accuracy. In this case the multiple of 20 increases the base (A), the 

 right angle (B), and the diagonal (C) to 60, 80, and 100 feet respec- 

 tively. The higber the multiple used the more accurate will be the 

 right angle. 



To set out the right angle as illustrated stretch the wire from (a) 

 to (e) and put in the row of ])egs. Tlien remove the wire to (a) 

 ((Z),but before making it fast at (r/) measure 100 feet from the fourth 

 peg (6) on tlie base to the fifth mark (r) o;i the right angle wire. 

 When tlie points (a, h, and f) coincide as shown, make the wire fast 



