2l6 SCIENCE OF SUCCESSFUL THRESHING. - 



in line and in center of the box and put stiff putty around 

 the shaft against the ends of the box to keep the babbitt from 

 running out. Be sure to leave air-holes at each end on top, 

 making a little funnel of putty around each. Also make a 

 larger funnel around the pouring hole, or, if there be none, 

 enlarge one of the air-holes and pour into it. These putty 

 funnels should extend a little above the box so as to give 

 pressure to the babbitt and to allow the metal to fill in, as it 

 shrinks in cooling. The metal should be heated until it is 

 just hot enough to run freely and the fire should not be too 

 far away. When ready to pour the box, do not hesitate or 

 stop, but pour continuously and rapidly until the metal ap- 

 pears at the air holes. The oil hole may be stopped with a 

 wooden plug and if this plug extends through far enough 

 to touch the shaft, it will leave a hole through the babbitt so 

 that it will not be necessary to drill one. 



A Split Bo.v is babbitted in the same manner except that 

 strips of cardboard or sheet-iron are placed between the two 

 halves of the box and against the shaft to divide the babbitt. 

 To allow the babbitt to run from the upper half to the lower, 

 cut four or six V shaped notches, a quarter of an inch deep, 

 in the edges of the sheet-iron or cardboard which touch the 

 shaft. Insert three or four thicknesses of cardboard called 

 "liners" between the halves of the box to allow for taking 

 up wear. Bolt the cap on securely before pouring. When 

 the babbitt has cooled, break the box apart by driving a cold 

 chisel between the halves. Trim off the sharp edges of the 



