Abstract: In a gyro horizon type of equipment, roll corrections are fed to the aircraft symbol which is a normally fixed display element and pitch correction is introduced on a movable display element or drum with modification of the position of the display elements of the instrument gyro as a function of an interconnection of the instrument gyro with a gyromaster reference through comparators connected to each of the roll and pitch systems.

Abstract: A thermostat valve of the type actuated by a wax cylinder incorporating a needle piston, wherein the diameter of said needle is reduced at least at a portion thereof which is received in a bore of the wax cylinder.

Abstract: A reactionless drive system is disclosed comprising in combination a base, a torquer mechanism, the stator portion of which is affixed to the counter-rotational inertia member and accepting control signals from sources external to the system. A rotatable member, coupled to the torquer, is driven in a first direction. A torque compensator consisting of stator and rotor members is coupled between the base and the first mentioned rotatable member in one instance, and to an oppositely rotating member in another instance. All the foregoing components act together to maintain angular momentum of the system during its operative mode to a value of substantially zero. An electronic subsystem is provided which senses the angular velocities of the rotating members and provides a feedback signal to the torque compensator.

Abstract: A redundant inertial measuring system includes three strapdown platforms each having two inertial sensors. The sensitive axes of the sensors are discretely disposed relative to the faces of a dodecahedron. The sensors and their associated electronics are physically and electrically separated from each other within each of the platforms.

Abstract: An improved second order gyroscopic attitude and heading reference system including separate variable time constant accelerometer integrators for independently controlling the velocity error signals associated with respective east and north acceleration signals to provide velocity damped output signals so that a high acceleration input signal of dubious accuracy will have minimal precessional authority while a lower acceleration input signal of greater accuracy will retain nominal control.

Abstract: A control mechanism adapted for incrementally and positively controlling the displacement of a biassed member or the like associated with a bicycle gear-change transmission between a plurality of predetermined positions for effectuating changes in gear ratios of such transmission in response to unidirectional movement of an operator control lever of the control mechanism. In addition, the control mechanism is also, preferably, provided with an "overshift" arrangement which effectively and effortlessly enables an operator to shift the bicycle sprocket chain from one sprocket to another sprocket of larger diameter. In an alternate embodiment, the control mechanism is directly mounted on and connected to a derailleur type bicycle change-gear mechanism.

Abstract: A gyroscopic stable reference system for navigable craft is provided that provides heading, pitch, and roll outputs substantially free of errors at all aircraft attitudes.