36 SCIENCE OF SUCCESSFUL THRESHING. 



der oil is quite thicjfc, especially in cold weather, and it is 

 much easier to filrthe lubricators if the oil be warmed and 

 the cups heated by blowing a little steam through them. An 

 expert is often called to an engine because of the valve being 

 "off" when the trouble is only poor cylinder lubrication. 



Hard Oil has many qualities to recommend it. It stays 

 on the bearing, and as it wears well, a little of it will go a 

 long way. The usual method of applying hard oil is by 

 means of compression cups, of which the one used on the 

 cross-head is an example. Each time the engine is stopped, 

 the cup should be turned to take up the "slack" and force in 

 a little grease. 



Approximate Cost of Oils. The price of oil varies so 

 greatly that no specific figures can be given. However, it 

 may be stated that good lubricating oil cannot be purchased 

 in quantities of five- or ten-gallon lots at less than twenty-five 

 cents per gallon, while cylinder-oil, in like quantities, cannot 

 be purchased ordinarily at less than fifty cents per gallon, 

 These are minimum figures, and in localities where commod- 

 ities in general are high, the retail prices of good oils may be 

 twice as high as those quoted, or even more. 



The "Ideal" Spring Grease Cup. This is a compression 

 cup in which the hard oil is forced out by a plunger pressed 

 down by a spring. The action of the spring is limited by a 

 thumb screw so that only the desired amount of grease will 

 be fed. This cup is used on the crank-pin of all Case engines. 

 To fill, raise the plunger by screwing down the thumb nut as 



