The ornamental design for a weight of dowsingpendulum, as shown and described.
FIG. 1 is a front view of a weight of dowsing pendulum, according to a second embodiment of our new design containing a granular material, the rear view being identical;
FIG. 2 is a right side view of a second embodiment thereof, the left side view being identical;
FIG. 3 is a top view of the second embodiment thereof;
FIG. 4 is a bottom view of the second embodiment thereof; and,
FIG. 5 is a perspective view of the second embodiment thereof.