FLUIDITY AND PLASTICITY

AB to CD, but the point of maximum pressure M is not at the
center of the block nor is it necessarily the point of application
of the resultant pressure exerted on the block.

If the bearing is free to move, it will move either up or down
until the pressure is just equal to the load. As the load is
increased, the surfaces approach each other, which increases
the friction and thereby the pressure so that equilibrium is
restored. But the point of application of the resultant pressure
changes with the load provided that the inclination of CD remains
the same.

Case III. Revolving Cylindrical Surface—Bearing Surface
Flat—The curves of motion are represented in Fig. 84. To the

FIG. 84.—Simple continuous lubrication.

right of GH which is the point of nearest approach of the sur-
faces, the curves are similar to those in Case II. At the left of
GH, the curves are quite the reverse of those on the right, being
convex toward a section MzNz on either side, just as they are
concave to a section MtNi on the right. The reason for this is
that with a uniformly varying velocity more fluid would be
brought in at the right of MiNi than would pass the section GH,
hence the fluid must flow outward from MiNi, where the pressure
is a maximum in both directions. So at the left of GH more
fluid would be carried away than arrives through GH, hence an
inflow is necessary to the right and left of the section of minimum
pressure M^Nz. The fluid pressure acts to separate the surfaces
at the right and to draw them together at the left hence there is a
couple of forces resulting.

If the bearing is cut away at the left of GH, the negative pres-

J sures may be eliminated.