Abstract: A welding mask is disclosed comprising an opaque face shield having a viewing opening therein, a filter lens pivoted to the face shield adjacent the viewing opening, moving means to move the filter lens pivoted to the face shield adjacent the viewing opening, moving means to move the filter lens from a closed to an open position, said moving means including electrical transducer means to cause pivotal movement of said filter lens, restoring means to restore the filter lens to the closed position, and electrical control means for said transducer means, said control means including electrode voltage sensing means to sense the electrode voltage of an arc welder and circuit means responsive to the sensed electrode voltage to provide energy to said transducer means when the voltage rises above a predetermined maximum value and to not provide energy to the transducer when the sensed voltage falls below a predetermined minimum value.

Abstract: An artificial limb (e.g., leg) is provided with rigid members simulating the lower and upper halves of the lower leg, the knee joint and the upper leg. At each joint is a sensor-potentiometer similar to the joy-stick of a computer game arranged so that relative movement of rigid members cause movement of the joy-stick. Leads from the outputs of the sensors are connected to an analog-to-digital converter connected to a personal computer. In teaching first aid for fractured limbs, the student is taught to apply splints and move the patient to a stretcher with as little relative movement as possible. The training device indicates relative movement. The screen may display positions of the rigid members in two planes and/or numerical tallies.