248 



FARM MACHINERY 



the paint adheres well; the latter keeps moisture from 

 entering, thus preventing the wood from rotting under 

 the iron. After ironing, two more coats of red lead 

 paint should be added, then stripes, and finally a coat of 

 wagon varnish. The box should be sandpapered, then 

 painted with three coats of good pigment, after which it 

 is striped and varnished. 



355- Capacity. As a wagon is subjected to shocks, it 

 must be designed to carry many times any load which 

 may be placed upon it. The following table is the aver- 

 age capacity of wagons as furnished by several manu- 

 facturers : 



Wagons with Skeins 



Size of Skein Capacity 



2^ 800 



2J4 I,OOO 



2}i 1,200 



2^2 I, OOO 



2^4 2,000 



3 3,000 



3^4 4,000 



3 1 A 5,5oo 



324 6,500 



4 8,500 

 4J4 10,000 



4 T /2 I2,OOO 



356. Draft of wagon. The draft of a wagon is the 

 resistance encountered in moving the wagon with its 

 load. It is often called tractive resistance, and is worthy 

 of careful consideration, for a reduction in the draft of 

 wagons not only means increased efficiency on the part 

 of the draft animals, but also a reduction in the cost of 

 transportation. The draft of wagons is made up of three 

 elements : (a) axle friction, (b~) rolling- resistance, and (c) 

 grade resistance. 



