6O SCIENCE OF SUCCESSFUL THRESHING 



liable to throw off the main belt; if traveling, a sudden 

 start throws unnecessary strain on the gearing and the 

 connections between the engine and its load. When the 

 engine has been running a sufficient time to allow any 

 water that may be in the cylinder to escape, cylinder-cocks 

 may be closed. When the engine is at work leave the 

 throttle wide open, allowing the governor to control the 

 speed. 



An engine provided with a friction clutch is much 

 easier handled when traveling than one without, but the 

 clutch is seldom used by a good engineer. If used con- 

 tinually it requires attention to keep it adjusted. 



Steering. An engine cannot be properly guided unless 

 the steering-chains are correctly adjusted. H too tight 

 they cause the steering-wheel to turn hard, while if too 

 loose, the guiding is much more difficult and the control 

 uncertain. The chains are properly adjusted when one 

 turn of the steering-wheel takes up the slack. A weak 

 steering-chain is dangerous and if one has been broken by 

 running into something, or from any other cause, it should 

 not be allowed to go indefinitely, temporarily repaired 

 with a bolt or piece of wire, but should be fixed so that it 

 is as strong as ever. 



In guiding an engine many make the mistake of turn- 

 ing the steering-wheel too much. It is well to remember 

 that a turn in one direction always means a turn in the op- 

 posite direction. Theoretically, the engine would follow 



