Abstract: An anti-rotation device is provided for stringing a cable or wire while reducing a twisting moment of the cable or wire as it is strung. The device includes a tow component, having multiple tow sections pivotally connectable end-to-end. A plurality of insulated weighted tail components are suspended so as to hang from the tow component. Each of the insulated tail components include weighted tail sections releasably connectable end-to-end to one another. At least one electrically insulated tail section is provided in each insulated tail component between the tow component and the weighted tail sections. The tail components are constrained to only articulate relative to the tow component in the single plane of bending of the tow component.

Abstract: A hazard detection and suppression apparatus and a single-action discharge valve for discharging a vessel's contents. The valve has a valve body with a passage therethrough through which the contents are discharged, a frangible seal held within the valve body and sealing the passage while the seal is intact, and a solenoid including an armature moveable from a first to a second position. A thermopile or a thermopile matrix senses near-infrared energy to detect a fire hazard and actuate the valve. Amplifiers for the thermopile's signal are monitored for failure. A thermostat or a manual pushbutton can also actuate the valve, and an operator's panel monitors failure conditions. Other hazard detectors may be used including a petroleum detector, a chemical sensor, a moisture detector, a radiation detector, a gas detector, and a moving body detector.

Abstract: A hazard detection and suppression apparatus and a single-action discharge valve for discharging a vessel's contents. The valve has a valve body with a passage therethrough through which the contents are discharged, a frangible seal held within the valve body and sealing the passage while the seal is intact, and a solenoid including an armature moveable from a first to a second position. A thermopile or a thermopile matrix senses near-infrared energy to detect a fire hazard and actuate the valve. Amplifiers for the thermopile's signal are monitored for failure. A thermostat or a manual pushbutton can also actuate the valve, and an operator's panel monitors failure conditions. Other hazard detectors may be used including a petroleum detector, a chemical sensor, a moisture detector, a radiation detector, a gas detector, and a moving body detector.