Abstract: A wind turbine apparatus for cooling of air having a wind turbine axially connected to a refrigeration compressor arranged to compress refrigerant, at least one tube for conducting compressed refrigerant centrifugally outwards, a construction for causing the compressed refrigerant to lose pressure so as to cool fades of the wind turbine, and a conduit for returning spent refrigerant centripetally to the compressor.

Abstract: A needle apparatus having a thin walled sleeve and a tubular needle closely engaged by the sleeve. The needle has a sharp point which initially extends from the sleeve. The needle and sleeve are mounted to a hub and are longitudinally moveable relative to one another. The needle is arranged to pierce tissue and the sleeve enters the incision formed by the needle. The needle may then be withdrawn from the tissue by applying traction to the hub.