Abstract: A practice putting device in which a golf ball has two equal and one smaller mutually orthogonal principle mass moments of inertia. The center of mass is in the center of the ball. Weights, such as metal shapes denser than the ball are embedded on diametrically opposite sides of the ball. The center of gravity of each weight and the center of the ball are coincidental with the axis of rotation corresponding to the smallest of the moments of inertia. The product of the square of the distance of the center of gravity of each weight from the center of the ball and the magnitude of each weight (i.e., r.sub.cg.sup.2 .times.W) is between 0.005 and 0.05 in.sup.2 -lb. Thus, the weights will tend to align this axis of rotation perpendicularly to a second axis of rotation if the ball is caused to rotate about the second axis.

Abstract: A quiver includes a frame releasably holding arrows and mounted on a bow for movement between a storage position, in which the arrows are disposed parallel to the bow, and a nocking position, in which the arrows are placed across the bow and the bowstring thereof. The frame carries a drive member which extends axially at an acute angle to the bow, and the drive member is driven by an actuator through simultaneous axial and rotational motion to move the frame from the storage position to the nocking position.