1 1 



8 



ANGLE OF LOCK 



CH. XIV 



further round than a coach, and consequently can 

 be turned in a smaller space. 



By the following method the angle of lock of a 

 coach is found by a simple measurement, without 

 any computation : — 



Place the coach on a level floor and block the 

 hind wheels, put the pole in its place, and mark 

 upon it a point ii ft. 8 in. (140 inches) from the 

 perch-bolt. With a pole of the usual length this 

 point will be near its end. Put the fore-carriage 

 hard on the lock (Fig. 153), and with a plumb-bob, 





Fig. 153. 



or any convenient substitute therefor, drop a line 

 to the floor from the point marked on the pole 

 and mark that spot on the floor ; then, taking care 

 not to disturb the position of the hind wheels, 

 put the fore-carriage on the other lock and mark 

 on the floor the spot vertically under the point 

 on the pole ; measure the direct distance between 

 the two marks ; the angle given in the following 

 Table, opposite to that distance, is the angle of 

 lock. 



