Abstract: An air flow system for a disk file is disclosed in which air is pumped under pressure past the disk surfaces to remove contaminants and past a voice coil actuator to cool the motor and returned to an inlet in the pump. A thermostatically controlled air diverter is placed in the air circulating path to reduce the range of temperature change in the disks and thus minimize the track misregistration problems which might occur as a result of differential thermal expansion of the disks and related components. The thermostatically controlled diverter valve functions to control the volume of normally lower temperature ambient air entering the system by controlling the volume of air exhausted from the system in accordance with the temperature of the air being circulated.

Abstract: A tire traction apparatus for use on a tire comprising at least one chain having first and second ends and a length slightly greater than the circumference of the tire, a latch for securing the first end to a portion of the chain proximate the second end, and a plurality of generally U-shaped members affixed to the chain at spaced-apart intervals, the members including a tire tread engaging base portion and a pair of opposed tire sidewall engaging portions, the chain serving to provide improved traction on ice, the base portion serving to provide improved traction on snow, and the tire sidewall engaging portions serving to maintain the chain on the tread.