Abstract: A U-shaped frame is secured to a pair of spaced fence posts, and the frame has yoke members which secure the U-frame at the top and the bottom to the fence posts. A one-way gate or turnstile is provided by rotatable members on the U-frame having turnstile arms. A means of removably securing the U-frame to the fence posts is in the form of members securing the fence posts which can be manually tightened. The entire turnstile is designed to be readily removable from the fence line or readily insertable in a fence line; if the fence posts to which it is attached are weak, the U-frame tends to strengthen them.

Abstract: A person being tested looks into a mirror through which is exhibited on a surface displaced upwardly from the striking row a previously prepared sheet of paper inserted into a conventional typewriter. The path of viewing passes through a Dove prism or other optical system to rotate optically the material prepared in miniature on the paper. The prepared material may be in miniature letters, symbols, etc., and is viewed through a magnifying lens which permits clear visibility of the miniature material. The optical rotation permits the commands or stimuli on the paper to be prepared in a vertical orientation and yet be viewed in any surface orientation, notably as horizontal words, letters, or numbers. Other symbols, lines, shapes, designs, textures, pictures, or colors may also be used as commands. A clock is actuated with the subject's first response on a row and is stopped at completion of the row of typing.

Abstract: An underwater diver is provided with a video camera, light, and communications supplied with electrical current from the surface by a shipboard electrical circuit. The diver is protected from accidental excessive voltages and current by magnetically isolating the diver's current from the shipboard current and by employing optical feedback to control the voltages for the diver. Additionally, a standby battery is employed to energize this equipment when the shipboard power fails. The entire shipboard power supply is contained in a waterproof box upon which is also mounted a video monitor and a video recorder, both secured in watertight fashion to the box.

Abstract: A pair of parallel cylindrical rollers have contrarotation maintained by a pair of gears. The cylinders and gears are enclosed by a housing that acts as a safety shroud, and one of the cylinders is rotated manually by a drive member external to the shroud. The safety shroud has an entrance slit and an exit slit for passing a tube between the rollers, and the dimensions of the slits transverse to the roller axes are carefully selected to prevent entry and damage to the fingers of children and adults. The shroud housing provides bearings for the rollers and for a spring mounting of one of the rollers to admit tubes of varying thickness and to grip tubes securely regardless of irregularities in the tube being squeezed.

Abstract: A diver's helmet is held to his head by means of a movable pad which engages the back of the neck, preferably near the base of the skull. The pad is preferably manually movable by means of any suitable mechanism to engage the diver's neck.

Abstract: A scum drag for removal of floating scum from a closed methane generator is a float having a fence or rake extending upwardly. Draglines are connected to it to pull the float and fence in a direction transverse to the fence. The pile of scum that accumulates with movement is engaged by the fence and bodily moved to a scum exit, where it is discharged into a truck or otherwise transported away.

Abstract: A plastic pipe coupling is formed by a pressing operation upon a section of extruded pipe that has been heat softened. The method of forming includes enclosure of the entire pipe section in a mold and longitudinal compression of the heat softened plastic to obtain wall thickness greater than the original extruded pipe section. The apparatus includes compressor members to shorten the heat softened extruded pipe section, a rigid external die or mold to shape the exterior, expanding mandrels made of mechanically rigid materials to accurately form the interior, and structure to accurately position the mandrels with respect to the outer mold to obtain accurate wall thickness.