Abstract: A rate integrating device includes a torquer in open loop configuration for torquing the device to null and a load connected to the device in closed loop configuration for maintaining the device at null. The load loop includes electrical means whereby the maintenance of the device at null is controlled independent of its dynamic characteristics for increased accuracy and stability.

Abstract: Disclosed herein is an arrangement for counteracting mass unbalance in a rotatable assembly, such as the rotor assembly of a gyroscope. The invention proposes the use of two coaxially and mutually independently rotatably displaceable, mass eccentricity-producing balance weights, of which each can be assembled with a support element forming part of the rotatable assembly in any one of a great number of angular orientations.

Abstract: A hand-held tool connectable to an appropriate power source and providing an output oscillatory motion impartable to a tool such as a file or cutting device.

Abstract: In an azimuth reference system including a flux valve coupled to a synchro stator and a directional gyro having its outer gimbal mechanically coupled to the synchro rotor, a low power electronic slaving circuit having its input electrically coupled to the rotor of the synchro and its output coupled to a torquer for slaving the directional gyro into synchronism with the flux valve. The low power electronic circuit includes a phase compensated amplifier coupled between the synchro rotor and a demodulator for producing a bipolar slaving error signal which is coupled through a high gain amplifier to parallel connected coils in the torquer. A threshold detector circuit responsive to the speed of the gyro rotor controls a limiter feedback circuit in the high gain amplifier thereby limiting its gain when the gyro rotor has attained a predetermined speed.

Abstract: A control mechanism to dampen gimbal tumbling and to orient the axes of rotation of the rotor and the gimbals of a gyroscope when in an inoperative state. The control mechanism serves as an overriding stop to gimbal lock, dampens the gimbal rotation leading to tumbling and restores the gimbals to a given orientation upon the cessation of gimbal rotation. The overriding stop and dampening force in one embodiment are the plurality of cams and cam followers rotatably mounted and operatively connecting the inner and outer gimbals with the gyroscope frame, and in another embodiment a cam and cam follower arrangement rotatably mounted and operatively connecting the inner and outer gimbal in combination with a bearing surface operatively connecting the inner and outer gimbal with the gyroscope frame.

Abstract: A quick settling, accurate gyrocompass for obtaining an accurate, short reaction time azimuth reference is described. The device preferably comprises a four gimbal configuration supporting a limited angle, two degree of freedom packaged gyroscope. The outer two gimbals of the arrangement are employed to provide a horizontal platform using accelerometers or pendulums as a reference to thereby comprise a stabilized platform. The inner two gimbals are employed to provide rotation about the two input axes of the gyro. The two degrees of freedom gyro and the inner two gimbals of the supporting structure thus comprised are connected to operate in a "North seeking" mode wherein the object is to align the gyro spin axis so that it is parallel to the spin axis of the earth. The gyro rotor is slaved to the gyro case about the gyro input axis so that if the rotor axis is not parallel to the earth axis a gyro error signal results in each input axis due to the rotation of the earth.