Abstract: The invention relates to an outboard sterntube seal, for the oil-lubricated propeller shaft bearings of a ship, which is equipped with a water-side seal and an oil-side seal separated by a cavity provided with a drain duct leading into the interior of the ship to permit monitoring of the seal. Both the water-side seal and the oil-side seal are in the form of rotating mechanical seals which each include a slipring and a counterring, the oil-side seal being designed in such a manner that in the event of failure of the water-side seal the sealing surface of the oil-side slipring is loaded additionally in its direction of closure through a retaining ring by the water pressure prevailing in the cavity. The sterntube seal is also equipped with additional elements that elastically accommodate movement of the shaft and seal the cavity against oil and water. The sliprings and counterrings of the rotating mechanical seals each have at least two independently removable and circumferentially extending parts.

Abstract: A sealing ring retention device for use in rotary mechanical fluid seals subjected to high fluid pressure and/or high temperature environments which utilizes unitary locking and anti-rotational structural features.

Abstract: A method of manufacturing a high fin density heat dissipator is disclosed in which the dissipator is extruded through a die in a partially cylindrical shape with the elongated fins arranged on the base and extending radially therefrom. The extruded dissipator is straightened under tensile and bumping forces in a manner such that the base assumes a planar shape and the fins become substantially parallel to each other. Apparatus for straightening the extruded dissipator and a die for extruding the same are illustrated and described.

Abstract: A bulb-shaped flashtube is provided with a metal envelope to increase its strength and enhance its reliability and operating characteristics. The metal envelope comprises a hollow cylindrical container including an open bottom end and an inwardly extending annular flange at its top end which defines a window opening in the container. A circular base of insulating material is sealed in the open bottom end of the container. A plurality of conductors extend through the insulating base to support a plurality of electrodes within the container. A circular, transparent window is sealed to the annular flange inside the top end of the container for transmitting a flash of light upon electrical discharge between the electrodes.

Abstract: In the digital intervalometer disclosed herein, a vernier measurement providing a resolution finer than one clock period is obtained by charging a single capacitor both during the interval between a start signal and a subsequent clock pulse and also during the interval between a clock pulse subsequent to a stop signal and a delayed stop signal. The analog voltage to which the capacitor is charged is converted to a digital value, which digital value is then combined with a clock count accumulated between the stop and start signals to provide a combined digital measurement having a resolution substantially finer than one clock period.

Abstract: An improved rotating bellows seal is disclosed which includes a bellows core having an annular mounting plate at one end adapted to drivingly and sealingly engage a shaft and a bellows seal ring on the other end to sealingly engage a mating seal ring. The mating and bellows seal rings are provided with conical inside diametral surfaces to prevent leakage fluids from entering the bellows core.

Abstract: A conversion kit is provided for installation of rotary shaft seals in stuffing boxes that normally utilize packing secured in place by a packing follower bolted to the stuffing box. In a preferred embodiment, the kit accommodates stuffing boxes of different sizes by providing a shaft mating ring having a plurality of stepped surfaces on opposing radial faces, each adapted to fit a specific size of stuffing box, with the inner annular surfaces lapped flat, a stepped adaptor ring which can be realigned to accommodate each particular stepped surface of the mating ring with which it forms a seal and gaskets sized to fit each stepped surface of the mating ring. During installation the packing follower is aligned in a reverse direction from its normal alignment so that the leg adjacent the shaft faces outwardly away from the stuffing box. It holds the adaptor ring in place to compress a gasket between the adaptor ring and mating ring and a gasket between the mating ring and stuffing box.