Abstract: A system for exerting a force, for instance a vertical upward lifting force of a predetermined tension vs. time waveform on a suspended object is useful in training the operators of shoulder-supported rocket launchers. The system includes an actuator for generating a required tensile force, a non-stretchable line or cable for connecting the object to the actuator and an overhead guide supported on an overhead support structure. The cable passes over the guide means defining a portion of the cable directly supporting the object. The position of the guide is controlled, in a response to a deviation from verticality of the portion of the cable with suspended object, before the activation of the actuator so that the verticality of the object lifting force is maintained. In operation, a predetermined force is exerted on the object regardless of whether the object moves as a result of the force.

Abstract: A stereoscopic image generator for superimposing a stereographic pointer video signal onto a composite standard video signal, the genrator comprises a computer for generating the stereographic pointer video signal in response to an input signal representive of the three dimensional coordinates of a point in a three dimensional video image, a video synchronizing circuit for receiving the composite standard video signal and delivering a synchronization signal to the computer, and a video keying circuit for receiving the composite standard video signal and the stereographic pointer video signal and superimposing the stereographic pointer video signal onto the composite standard video signal to produce a single combined video signal, the single combined video signal allowing the stereographic pointer video signal and the composite standard video signal to be viewed together simultaneously on the same video screen.

Abstract: The present invention comprises a solid composition having low magnetic signature. The composition comprises a plurality of high density, very low magnetic signature bodies or particles incorporated in a non-magnetic matrix of lesser density.