Abstract: An explosion proof power supply enclosure for hazardous atmosphere lighting systems having multiple, identical explosion proof inlet and outlet openings to handle both high voltage AC circuits and low voltage DC intrinsically safe circuits. Each enclosure has thick, flat metal plate end walls and a plurality of identical circular openings located side-by-side in such walls. Each opening has an internal smooth walled surface configuration defining one side of a flame-quenching path. For AC power connections, explosion-proof receptacles are fitted in some of the openings with each receptacle having external surface configurations that define the other side of the flame quenching path.

Abstract: A luminaire comprises a transparent enclosure tube, a cylindrical handle housing at one end of the tube, and a cylindrical cap housing at the opposite end of the tube. A light carriage within the tube comprises a unitary subassembly consisting of a rigid reflector having light bulb holders at opposite ends and a fluorescent bulb secured between the holders. The light carriage is removeable and replaceable as a unit without tools through an open end of the tube by unplugging it from and plugging it into a contact receptacle in the handle housing. Complementary plug and socket formations in the handle housing and light carriage assure alignment of bulb contacts. The housings have castellated ends engageable with detents on mounting brackets on a base to hold the luminaire and to direct light in a selected direction. The cap housing has a telescopical end section which is manually moveable against a spring to release the luminaire from the base without tools.

Abstract: Apparatus for collecting grassland bales comprises a pair of open-ended cradle structures (42, 44) each of which is pivotally mounted on each of two opposite sides of a trailer (10). The cradles can be lowered from an inboard stowed position into an inverted position by pivoting the cradles relative to the trailer so that the cradles are lowered to collect a load. The cradles can lift the load into a stowed position by being raised inboard of the trailer.

Abstract: Safety apparatus for indicating a live alternating current voltage condition in an insulated electrical conductor having a central conductor wire comprises: an electrically conductive external sheath extending along a predetermined length of the insulation forming with the central conductor wire a capacitive alternating current path across the insulation; and a signal generating circuit including a full-wave rectifier connected directly between the sheath and ground. A capacitor and a neon or other gas discharge bulb characterized by avalanche breakdown at a predetermined voltage are connected in parallel with the rectifier. Optionally, a piezo electric or other sound-generating device may be in series with the neon bulb. When the central conductor wire is energized at 1000 volts AC or above, the bulb flashes, and the optional sound generator activates, at a frequency dependent on the length of the external sheath along the insulation.

Abstract: Apparatus for cooling an electrical enclosure for use where headroom is limited. An imperforate top wall and a perforate ceiling wall below it define an exhaust compartment. The ceiling wall has openings above natural hot spots on heat-producing electrical components in the enclosure to receive heated air rising by convection. In one embodiment, louvered intake openings and internal baffles direct cool, external air to the bottom of the head-producing components. A fan draws heated air from the exhaust compartment and discharges it through a louvered orifice outside the enclosure, thereby augmenting the natural upflow of heated air by convection and preventing accumulation of heated air. In another embodiment, especially suited to dusty or corrosive environments, the electrical components are completely sealed, and clean inside cooling air is continuously recycled in a closed circuit between the heat-producing components and refrigerant-cooled heat-exchange apparatus.

Abstract: A dispersant composition suitable for dispersing crude oil or petroleum products floating on the surface of water comprises a combination of a selected non-ionic surfactant and an anionic surfactant in a suitable solvent. The non-ionic surfactant is an ester of a polyalkoxylated sorbitol or sorbitan and a fatty acid. The anionic surfactant is selected from the group comprising calcium sulphonate, magnesium sulphonate, sodium sulphonate, triethanolamine sulphonate and isopropylamine sulphonate. Suitable solvents are C.sub.5 to C.sub.10 alcohols, glycols and glycol ethers. The dispersant composition is particularly suitable for use in cold, low salinity water.

Abstract: A control system for a booster type belt conveyor having one or more booster belts spaced at intervals along a conveyor belt with the upper, driving run of each booster belt frictionally engaging the underside of the conveyor belt carrying run. Each belt has a driving pulley connected to a driving unit including one or more electric motors, engageable and disengageable fluid couplings, and a gear box. The conveyor is for heavy duty service, in long lengths of several miles. There is an electrical control assembly for each drum or pulley driving unit. These automatically start the motors in sequence while the couplings are disengaged, each being started in response to a signal from a previously started motor that it has reached running speed. An electrical loop interconnects all the control assemblies and contains relays which, when the loop is energized to actuate the relays, cause the fluid couplings to engage.