FIG. 1 is an elevated, perspective view of the base for oscillating lawn sprinkler in accordance with my invention;

FIG. 2 is a back elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in FIG. 1 are for illustrative purposes only and form no part of the claimed design.