Dynamoelectric machines

Claim 1

IN A DYNAMOELECTRIC MACHINE, AN ARMATURE CORE COMPRISING A PLURALITY OF LAMINATIONS EACH HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED TEETH, SAID LAMINATIONS BEING DISPOSED IN A STACK AND SECURED TOGETHER, THE TEETH OF THE LAMINATIONS BEING OFFSET WITH RESPECT TO TEETH OF ADJACENT LAMINATIONS TO FORM HERRINGBONE-SKEWED SLOTS IN SAID CORE, SAID SLOTS HAVING A PORTION SKEWED IN ONE SENSE AND ANOTHER PORTION SKEWED IN AN OPPOSITE SENSE, SAID SKEWED PORTIONS MEETING AT A JUNCTION INTERMEDIATE THE ENDS OF THE CORE, THE LAMINATIONS AT AND ADJACENT SAID JUNCTION HAVING TEETH OF DECREASED WIDTH TO PROVIDE INCREASED SLOT WIDTH ADJACENT THE JUNCTION, SAID LAMINATIONS AT AND ADJACENT THE JUNCTION BEING OF REDUCED OUTER DIAMETER, INSULATED WINDINGS LYING IN SAID SLOTS, RADIALLY EXTENDING VENTILATION FINGERS SECURED AT THE ENDS OF SAID CORE, SAID FINGERS BEING TWISTED AT THEIR OUTER ENDS SO AS TO BE PARALLEL TO THE SIDE WALLS OF SAID ADJACENT SLOTS AND OTHER RADIALLY EXTENDING VENTILATION FINGERS DISPOSED INTERMEDATE A PAIR OF ADJACENT LAMINATIONS ADJACENT SAID JUNCTION.