CH. XIV 



ANGLE OF LOCK 



339 



Example : The first position of the pole being 

 indicated by the black lines, and the second by the 

 dotted lines, the coarse dotted line will be the 

 distance, = 8 feet, and the angle of lock will be 20 

 degrees on each side of the central position of the 

 pole. 



Table for Angle of Lock. Point on Pole ii Ft. 8 In. 



The length of the perch also affects the space in 

 which the coach will turn : the shorter the perch the 

 less will be the width required. 



The following Table shows how much the diam- 

 eter of the circle made by the outer front wheel is 

 affected by different angles, and lengths of perch : — 



Perch 6 Ft. 6 In. 



