192 



AGRICULTURAL ENGINEERING 



supplied by screwing off the inclosed end of the wheel box. 

 The grease thus works toward the inside end of the box and 

 still further assists in excluding the 

 dirt and grit. 



Oil and Grease Cups. The gen- 

 eral character of a machine can often 

 be determined by the kind of oil and 

 Fig. 105. An inclosed grease cups used on the machine. 

 No machine should be purchased 



which does not have an adequate provision for lubricating 

 all bearings. 



Babbitting Boxes. Babbit metal is a mixture of several 

 metals having a rather low melting point, and is used to line 

 boxes. Genuine babbitt metal is mixed in 

 the proportion of 1 part of copper, 2 parts of 

 antimony, and from 6 to 24 parts of tin; but 

 the name is applied to many combinations of 

 metals used as a lining for boxes. Besides 

 furnishing a very satisfactory metal for a 

 bearing, babbitt metal can be quite easily 

 replaced. 



In preparing to babbitt a box it is neces- 

 sary to be provided with a melting ladle and 

 a fire, preferably a forge fire, to heat it. The 

 worn babbitt which is to be replaced is 

 carefully removed with a cold chisel and the 



box freed from grease and moist- 

 ure. The shaft is carefully blocked 

 into position, leveled and centered, 

 and the ends of the box closed by 

 cardboard collars fitting around 

 the shaft and held in place with 



Fig. 106. A sight 

 feed oil cup. 



Fig. 



107. A grease cup 

 feeding hard oil. 



for 



putty or stiff clay mud. 



