Abstract: A muscle exercise and rehabilitation apparatus comprises a movable arm against which a force can be applied; a servo motor mechanically coupled to the arm through a gear reducer; a sensing device for sensing the force applied to the arm and for producing a load signal corresponding thereto; a tachometer for producing a velocity signal corresponding to the velocity of the arm; a closed loop velocity servo feedback circuit for controlling the motor in response to a control signal and the velocity signal so that the arm has a constant resistive torque applied thereto and/or has its velocity regulated, regardless of the force applied to the arm, the feedback circuit including an amplifier for amplifying the load signal to produce the control signal, a torque control circuit and a speed clamp circuit for modifying the control signal of the amplifier to produce a modified control signal, depending on the mode of operation; a switch for switching in at least one of the torque control circuit, the speed clamp circuit

Abstract: A rockable toy with a reflecting mirror includes a body having a bottom surface which is outwardly curved in all directions, and a center of gravity which is situated within the region bounded by the bottom wall, so that the toy will have a tendency to oscillate about a stable position in which the center of gravity is situated above the point of contact of the toy with the underlying surface. The body carries a mirror which shares in the oscillatory movement of the body when displaced out of the stable position. The body carries, outside the periphery of the mirror, a head whose reflection can be seen in the mirror by the observer, together with a background which rapidly changes during the oscillatory motion of the toy. The head is connected to the body for movement relative thereto at least in two opposite directions. The body is of a rigid synthetic plastic material, while the head is of a flexible material so that it can be squeezed.