THE ANIMAL AS A MOTOR. 



67 



If the load be shifted to the front end of the cart, 

 as indicated in Fig. 3, the resultant of the forces PJ 

 and PK Hes in the direction of PZ, and the added 



Fig, 3. — Haulage of Vehicles. 



weight on the horse is 22 lbs. instead of 4 lbs. as in 

 Fig. I, tending to thrust his hind foot into the ground 

 at O, and he is able to pull 40 lbs. as against 33 lbs. 

 under the conditions indicated in Fig. i. 



It will be observed in Fig. i that the point of appli- 

 cation of force A (the hame) is above the horizontal 

 Hne UV, drawn through the point this being the 

 point at which the traces might be fixed with an 

 advantage equal to having them attached to the axle 

 when the given lift is exerted at A, with a lift at the 

 belly-band as set forth ; whereas P, the point of appli- 



