Dynamo-electric machines

Claim 1

A DYNAMO-ELECTRIC MACHINE HAVING A STATOR MEMBER INCLUDING A MAGNETIC CORE WOUND WITH A STATOR WINDING, A ROTOR MEMBER HAVING A SHAFT, AN AIR GAP BETWEEN THE STATOR AND ROTOR MEMBERS, A GAS-TIGHT HOUSING ENCLOSING SAID MEMBERS, A GASEOUS COOLING MEDIUM WITHIN THE HOUSING, FIRST AND SECOND STAGE COOLING MEANS WITHIN THE HOUSING FOR COOLING THE GASEOUS COOLING MEDIUM, THE FIRST STAGE COOLING MEANS BEING DISPOSED ABOUT THE STATOR MEMBER NEAR ONE END THEREOF, THE SECOND STAGE COOLING MEANS BEING DISPOSED ABOUT THE STATOR MEMBER NEAR THE OTHER END THEREOF, A FIRST SET OF RADIAL DUCTS IN THE STATOR CORE ADJACENT ONE END THEREOF AND COMMUNICATING WITH THE OUTSIDE OF THE STATOR CORE, A SECOND SET OF RADIAL DUCTS IN THE STATOR CORE ADJACENT THE OTHER END THEREOF AND COMMUNICATING WITH THE AIR GAP, A SET OF AXIALLY EXTENDING DUCTS WITHIN THE STATOR CORE COMMUNICATING WITH THE FIRST AND SECOND SETS OF RADIAL DUCTS, A BLOWER MOUNTED ON THE ROTOR SHAFT FOR CIRCULATING THE GASEOUS COOLING MEDIUM THROUGH THE MACHINE AND THE FIRST AND SECOND STAGE COOLING MEANS; AND GASEOUS COOLING MEDIUM FLOW DIRECTING MEANS FOR CAUSING AT LEAST SOME OF THE GASEOUS COOLING MEDIUM TO CIRCULATE SO AS TO PASS THROUGH THE FIRST STAGE COOLING MEANS, THEN THROUGH THE BLOWER, THEN THROUGH THE SECOND STAGE COOLING MEANS AND FOR CAUSING SOME OF THE GASEOUS COOLING MEDIUM ISSUING FROM THE SECOND STAGE COOLING MEANS TO ENTER THE SAID FIRST SET OF RADIAL DUCTS AND TO BE RETURNED TO THE FIRST STAGE COOLING MEANS AFTER IT HAS TRAVERSED THE AXIALLY EXTENDING DUCTS, THE SECOND SET OF RADIAL DUCTS AND SUBSTANTIALLY THE WHOLE LENGTH OF THE AIR GAP.