CHAP, v.] DRAWING RECTANGULAR LINES 



173 



From B and C draw, witli a radius about half as much again Erecting 

 as A B, short arcs intersecting one another. A hne drawn dicuiT/^o 

 through this intersection D, from A, will be at right angles to ^ Line 



A T> s & fj-om any 



A B. Point not 



Take any point B, Fig. 51, in a direction about 45° f rom ^^^'^ i*^ 

 A, and from it as centre, with the radius B A describe a short tremity. 



Fig- 51 



arc intersecting A D in C, and likewise a short arc E F in the Erecting 

 opposite direction. Join C B and produce it to intersect E F ^.^erpen- 



■'•■'■ . . dicular 



in G. A line joining A and G will be at right angles to A B. from the 



In all careful work these operations should be checked hy ^°^ °^ * 



repetition, \Wth different radii. 



