Liquid cooling of generator rotor windings

Claim 1

IN AN ELECTRICAL MACHINE INCLUDING A ROTOR MOUNTED ON A SHAFT, WINDINGS ON SAID ROTOR, EACH WINDING COMPRISING A HOLLOW CONDUCTOR HAVING END TURNS ADJACENT ONE END OF SAID ROTOR AND SPACED RADIALLY OUTWARDLY FROM SAID SHAFT, MEANS FOR SUPPLYING A COOLING LIQUID TO EACH END TURN, SAID MEANS COMPRISING A HOLLOW CYLINDER FIXED ON SAID ROTOR BETWEEN THE END TURNS AND SAID SHAFT AND WITH THE INNER SURFACE OF SAID CYLINDER SPACED RADIALLY OUTWARDLY FROM SAID SHAFT, INSULATING MEANS DISPOSED BETWEEN THE OUTER SURFACE OF SAID CYLINDER AND THE END TURNS, SAID CYLINDER HAVING AN ANNULAR GROOVE IN THE INNER SURFACE, MEANS PROVIDING COMMUNICATION BETWEEN SAID GROOVE AT THE BOTTOM THEREOF AND EACH OF SAID END TURNS, AND A STATIONARY PIPE DISPOSED IN THE SPACE BETWEEN SAID SHAFT AND SAID CYLINDER FOR SUPPLYING COOLING LIQUID IN A FREE JET TO SAID GROOVE, WHEREBY UPON ROTATION OF SAID ROTOR CENTRIFUGAL FORCE CAUSES LIQUID TO FLOW FROM SAID GROOVE THROUGH SAID END TURNS, THE DEPTH OF SAID GROOVES SERVING TO LIMIT THE MAXIMUM QUANTITY OF LIQUID SUPPLIED TO SAID END TURNS.