Abstract: A ring laser is provided with at least one retroreflector external to the ring laser closed-loop path for redirecting energy extracted from one of the counterpropagating beams into the opposite traveling counterpropagating beam. The redirected energy is modulated so as to oppose the normal coupling between the counterpropagating beams which causes lock-in.

Abstract: Fiber optic rotary coupler apparatus is disclosed in which a light signal formed in a continuous ring in a plane is transmitted between a barrel and a surrounding sleeve within which the barrel is rotatably mounted. The light signal ring is produced by a light source and an associated light transmitting fiber wound on the barrel in at least one complete circular loop of a radius such that a portion of a light signal introduced into an end thereof is transversely radiated from the fiber. Light detector means, which may include a further optical fiber for transmitting light signals to a remote detector, is carried on the sleeve. In one embodiment, a plurality of optical and electrical signal channels are incorporated into a single device.

Abstract: Optical slip ring apparatus is disclosed in which radial light signals formed in a continuous ring are transmitted between a barrel and a surrounding sleeve within which the barrel is rotatably mounted. The ring of light signals is produced and detected respectively by a plurality of light emitting diodes and light detector means carried on the barrel and the sleeve. The light detector means may include an optical fiber bundle for transmitting light signals to a remote detector. In one embodiment, a plurality of optical and electromechanical slip ring channels are incorporated into a single device.

Abstract: A device for impaling and lifting hay bales consisting of a long, round, pencil-pointed shaft for said purpose plus two shorter shafts of similar design protruding just below and to each side of the main impaling spear for the purpose of stabilizing the bale in the process of loading and handling. This structure is mounted on a rigid steel frame which is designed for attachment to any ordinary hydraulically operated front end loader, or for attachment to any common three-point tractor hitch. Optimum utility is achieved with a tractor having such devices mounted at each end for use at the same time.

Abstract: A hay hauler and feeder includes a platform of wood framed in steel with demountable racks which, when in place, serve as self-feeders, on sides, front and rear. Feeding stations are divided with steel bars angled to the right or left to limit and control hay withdrawal in order that the contents may be fed with minimum wastage. The hauler-feeder is mounted on a single axle mounting with four wheels in tandem which are capable of oscillation for maximum uniform weight distribution and a trailer jack at the front tongue for leveling when field-feeding.