274 APPLIED MECHANICS 
cup or box A, and is delivered slowly to the bearing through the wick B, 
which acts as a sypnon. It is important that the end of the wick which 
delivers the oil should be below the free surface of the oil in the cup, 
otherwise the oil will not flow through the wick. 
_ In pad lubrication a part of the bearing surface upon which there is 
no pressure is dispensed with, and its place is taken by a soft pad, which _ 
is kept saturated with lubricant. In bath lubrication the bearing con- 
tains a space filled with oil, which is in contact with a portion of the 
journal. 
Ring lubrication is illustrated by Fig. 417. In this bearing the 
journal carries two loose rings which rotate, being driven by frictional 
contact with the journal. These rings dip into an oil bath and carry oil 
to the top of the journal. The oil flows over the surface of the journal 
through oil grooves in the bearing, and finally returns to the bath below. 
ZA | 
DI B- ; 
Section at AB. Section at CD. Section at EF, 
Fie. 417. 
An example of forced lubrication is shown in Fig, 418. This illus- 
Seo. yA 
| wy ZZ 
NE PAS 
Fig. 418. 
trates Tilston’s system as applied to a journal bearing. A is the bearing, 
