Abstract: A ventilation system for use with a computer disc drive is described which enables disc file data storage capacity to be increased for a given volume of chamber housing the discs and which provides increased disc-drive performance. A plurality of axially extending channels is provided in the hub of the drive and a breather filter is located axially, at one end of the hub, in the housing wall of the chamber. Rotation of the discs causes air to be thrown out to the periphery of the discs creating a high pressure zone thereat and a low pressure zone at the rotation axis. Air is drawn into the low pressure zone and is communicated to the inter disc spaces via the axially extending channels from where it is thrown out by centrifugal force during rotation. A substantially constant air density is provided adjacent the disc surfaces leaving the aerodynamic characteristics of the read/write heads substantially unaffected and facilitating the reduction of interdisc spacing.

Abstract: A gas-insulated circuit interrupter includes stationary and movable contact assemblies which are cooperable with each other to transmit or interrupt electrical current. Means are provided for moving the movable contact assembly, and for establishing a flow in the circuit interrupter during an opening interruption to estinguish the arc which is drawn between the stationary and movable arcing contacts. A hollow insulating nozzle is utilized for directing gas flow. The interior surface of the nozzle is shaped so as to direct a flow of insulating gas to blast into the arc, and the exterior surface of the nozzle is contoured such as to deflect the flow of insulating gas away from the movable main contacts.