Abstract: A multi-port valve internally supports a rotatable trunnion having an elbow passage between a nozzle portion of the trunnion and a lower end outlet that communicates with a test port of the valve body. The outer end of the nozzle has an axially reciprocable hollow seal piston with a seal support ring whose outer face is formed with an endless groove to receive an O-ring. An actuating shaft is coaxially mounted in an upper end of the trunnion and has a lower end with an eccentric pin engaged in a slot of the seal piston to reciprocate the seal piston into and out of sealing registration around a port selected by rotation of the trunnion. External ends of the actuating shaft and trunnion are respectively drivably coupled to a coaxial sprocket wheel and geneva wheel. A housing on top of the valve contains an input rotor fitted with a cam and a drive roller for engaging radial slots of the geneva wheel alternately with cam engagement of the dwell notches of the geneva wheel.

Abstract: A human head trackable wide angle visual system is disclosed which probes y given terrain constructed on a model board and causes selected image portions thereof to be projected on a trio of display sectors located on the inside of a spherical screen, with the view thereof being displayed thereon in accordance with control signals that are respectively portional to the turning of said head about a predetermined axis thereof. A head position sensor, a cockpit, a switching logic circuit, a synchronization signals generator, a trio of video switches, the aforesaid screen, and left, middle, and right light projectors are uniquely combined to provide such effects and, thus, simulate a real-life pilot training environment from a model thereof.