A communications interface exchanges serial bit signals between sources differentially, over redundant, two conductor, primary and secondary channels. The primary channel provides the communications link during normal operation, and is monitored to ensure differential operation. In response to primary channel failure, the secondary channel becomes the communications link.

A mechanical vibration-tolerant whip antenna having, in combination, a multi-section conical metal tube having successive sections each joined by an internal rigid rod tightly fitting within a corresponding recess in the respective ends of each of the adjacent sections to be joined with the outer metal surfaces of the successive sections providing a continuous smooth external metal surface transition, and each rigid rod extending sufficiently above and below a node of mechanical vibration resona...

A clock generator source, a plurality of which can be used as redundant clock sources in a fault tolerant clock system. The input and output clock signals of said source being formed of a plurality of pulses having a frequency substantially higher than the frequency of the input and output signals, one pulse being omitted in each cycle thereof to form a "dead interval" therein when the input and output signals are in phase. When the output signal is not in phase with the input signal at the star...

A solenoid designed to operate immersed in a fluid containing magnetic particles of debris, and having a movable armature slidable toward and away from a fixed core within a bobbin carrying the electromagnetic coil. The bobbin is provided with internal flutes defining longitudinal passages opening at both ends of the solenoid for conducting magnetic particles or debris out through the passages as the solenoid armature moves toward the core.

A controller operable in a normal mode of operation to control an output device in response to a sensed condition includes means for detecting a fault in the controller or output device. Means are responsive to the fault detecting means for controlling the output device in a failsafe mode of operation wherein the output device is safely operated without regard to the sensed condition when a fault is detected. Means responsive to the fault detecting means causes a return to the normal mode of ope...

An improved jam-proof control including a cylinder-piston assembly in which the piston is controllably positioned within the cylinder to perform the control function and in which the cylinder snugly envelopes a deformable sleeve so that when the cylinder is deformed by sharp impact, the piston is permitted to continue to reciprocate within the cylinder due to the deformation, either due to frangibility or softness, of the sleeve.

A seal structure between first and second relatively moveable members for preventing gas flow in the space between the members and transverse to their general direction of motion is disclosed. The seal structure includes a plurality of substantially parallel strips within 30.degree. of normal to the radial plane generally containing these first and second relatively moveable members. The strips are thin and closely spaced and arranged so that one strip edge is attached to the first member and an...

This invention relates to herbicide-tolerant plants prepared by plant tissue culture. These plants are produced by culturing tissue of a plant sensitive to a particular herbicide in the presence of an amount of the herbicide, and for a time less than that sufficient to kill the entire plant-tissue population, but sufficient to kill a majority of the tissue population. If desired this procedure is repeated for sufficient passages, preferably with increasing amounts of said herbicide to provide a ...

The stator is made of laminated stampings having congruent outlines defining the central opening for a rotor and also defining pole pieces which include horn-like portions spaced from the main body of the stamping to define winding slots for the coil. Each end of the assembly has a terminal board which has an outline generally congruent with the laminations. Two terminals are mounted in the supports carried by the terminal board adjacent each pole piece. The ends of the wire of each coil are led...

An electric cable for shielding the conductor therein from tensile stresses during bending of the conductor in a predetermined lateral direction. An elongated duct having a pair of opposed sidewalls and a floor therebetween holds the conductive element, while an elongated lid of relatively substantial thickness is mounted in the opening to the duct between the free ends of the sidewalls. The lid fills the duct from the opening between the free ends of the sidewalls to the neutral surface produce...