TRANSMISSION OF POWER 4-1 



dency for the surfaces to abrade. Brass, bronze, and 

 babbit are used for bearings with a steel journal. It is 

 highly essential that the bearing be kept free from all 

 dirt and grit. Occasionally it is better to let some minor 

 bearings go entirely without lubrication, for the oil only 



FIG. 26 A SELF-OILING AND SELF-ALIGNING BEARING. OFTEN THE OIL 



RESERVOIR BELOW THE RINGS IS ENLARGED AND THE 



WICK DISPENSED WITH 



causes the gathering of grit and sand to grind out the 

 bearing. 



63. Heating of boxes may be due to (i) insufficient 

 lubrication, (2) dirt or grit, (3) the cap may be screwed 

 down too tight, (4) the box may be out of line and the 

 shaft may bind, (5) the collar or the pulley bears too 

 hard on the end, or (6) the belt may be too tight. 



Self-oiling boxes are very desirable where they can be 



