522 



Farm Mechanics. 



The action of the lubricator is caused by steam rising 

 into the bend B and condensing in the left leg. The water 

 being heavier than oil 

 flows through G across the 

 glass face D and falls to 

 the bottom of the oil reser- 

 voir, thus forcing a like 

 amount of oil up and out 

 through valve E and 011 

 into the steam pipe where 

 the steam carries it into the 

 steam chest and cylinders. 

 When the oil is all out of 

 the cup the water shows 

 through the face D, and the 

 lubricator must be refilled. 



653. FlyWheel In all 



single crank engines it is 

 very important to have a 

 well designed and ample 

 fly wheel in order to en- 

 sure steady running of the 

 engine. It will be clear 



that as the piston rod passes through the course of its 

 stroke its efficiency must rise and fall as it approaches 

 and recedes from the dead centers. The fly wheel, repre- 

 sented at 2 in Figs. 244, 249 and 250, enables energy to 

 be stored in its heavy fast-moving rim when the crank shaft 

 has the greatest efficiency and this may be given out again 

 to maintain the speed when the dead centers are being ap- 

 proached and passed. 



I 



FIG. 254. Swift sight feed lubricator. 



GASOLINE ENGINES. 



Within the past ten years there has been a strong move- 

 ment to place upon the market for farm use motors of the 

 internal combustion type and many kinds of gasoline en- 



