

TRACTOR 



the engine can be adjusted from 250 to 450 R. P. M. When the 

 entire load is thrown off the engine, as when stopping a thresher or 

 releasing the draw bar pull, the readjustment of all working 

 mechanism is automatic, positive and instantaneous. 



The drive wheels are built of steel and reinforced with angle 

 irons at the edges to prevent bending. The spokes are steel with 

 double forged heads to resist vibration. The hub is massive. Our 

 lugs have been carefully shaped and so pitched as to be self -cleaning. 

 This is important. An engine must not only generate power, 

 but it must grip itself to the earth with its steel teeth broadly and 

 firmly, so as to avoid, loss of power by slippage. 



GEARING 



The M. Rumely Company has built steam traction engines by 

 the thousands. We have studied the problem of power transmission 

 through gearing from twenty-five years of actual experience. The 

 reputation of our steam engines for durability and strength as 

 pullers shows how well we have solved these problems. From 

 this priceless fund of experience that is stored in our organization 

 we have drawn in designing our ov^f truck. The pitch and 

 shape of the gear teeth are so chosen as to get the greatest strength 

 with resistance to wear with the smallest possible friction loss. 

 The metal itself is of semi-steel that has a tendency to wear smooth. 

 Accurate tests showed a truck efficiency, including power spent in 

 transporting the engine itself, of sixty-five per cent, a record une- 

 qualed under similar conditions by any engine of its size. 



There is no idle gearing in operation at any time. When the 

 engine is used for threshing, under belt power, it can move itself 

 forward or backward without stopping the belt. 



The engine is provided with two friction clutches, one for use 

 in threshing and the other for starting and stopping the movements 

 of the truck. These clutches are provided with three and four 

 shoes respectively. They are handled easily 

 by a platform lever with little exertion on the 

 part of the operator. The toggle bolts are 

 adjustable to take up the wear of the wood ' ^ 



blocks. The front wheels pivot on 

 a ball and socket bearing, by which 

 they can adjust themselves to in- 

 equalities of the ground without 

 imparting their movements to 

 the engine as a whole. 



on "PuV 



the Dawn of 



Successful 



J^echanica) 



Plowing 



