Bearing testing apparatus

Claim 1

IN A DEVICE OF THE CHARACTER DESCRIBED FOR TESTING THE STEADINESS OF THE AXIS OF ROTATION OF A BEARING ADAPTED TO SUPPORT A SHAFT JOURNALLED THEREIN, FIXTURE MEANS FOR HOLDING SAID TEST BEARING IN FIXED POSITION, MEANS FOR ROTATING THROUGH A PREDETERMINED NUMBER OF REVOLUTIONS A SHAFT JOURNALLED IN, AND EXTENDING BEYOND, SAID BEARING, PICK-OFF MEANS FOR PRODUCING AN OUTPUT SIGNAL INDICATIVE OF RADIAL DISPLACEMENT OF ONE END OF SAID SHAFT WITH RESPECT TO SAID FIXTURE IN A DIRECTION SUBSTANTIALLY PERPENDICALAR TO THE AXIS OF SAID SHAFT, RECORDING MEANS FOR MAKING A PERMANENT RECORDING OF SAID OUTPUT SIGNAL FOR ALL OF SAID REVOLUTIONS OF SAID SHAFT, AND MEANS CONNECTING SAID RECORDING MEANS AND SAID ROTATING MEANS TO RELATE SAID OUTPUT SIGNAL TO THE ANGULAR POSITION OF SAID SHAFT AT WHICH SAID OUTPUT SIGNAL IS PRODUCED, WHEREBY A COMPRISON OF THE PERMANENT RECORDINGS OF THE PICKOFF OUTPUT FOR EACH REVOLUTION OF THE SHAFT PROVIDES AN INDICATION OF THE STEADINESS OF THE AXIS OF ROTATION OF SAID BEARING.