Multiple concentricity and perpendicularity gauge

Claim 1

A GAUGE FOR SIMULTANEOUSLY MEASURING CONCENTRICITY AND PERPENDICULARITY OF ANNULAR INTERNAL AND EXTERNAL SURFACES OF A WORKPIECE RELATIVELY TO A REFERENCE BORE THEREOF, SAID GAUGE COMPRISING A HOUSING STRUCTURE HAVING AN ANNULAR PILOT PORTION AND HAVING FIRST, SECOND AND THIRD BEARING BORES DISPOSED WITH THEIR AXES IN LATERALLY-SPACED PARALLEL RELATIONSHIP WITH ONE ANOTHER AND WITH SAID PILOT PORTION, FIRST, SECOND AND THIRD MOTION-TRANSMITTING MEMBERS LONGITUDINALLY RECIPROCABLY MOUNTED IN SAID FIRST, SECOND AND THIRD BEARING BORES RESPECTIVELY, MEANS FOR COAXIALLY ALIGNING SAID PILOT PORTION WITH THE REFERENCE BORE, FIRST, SECOND AND THIRD DIAL INDICATORS MOUNTED ON SAID HOUSING STRUCTURE AND HAVING OPERATING PLUNGERS EXTENDING INTO OPERATED ENGAGEMENT WITH SAID MOTIONTRANSMITTING MEMBERS, AN INTERNAL SURFACE CONCENTRICITY FEELER MOVABLY MOUNTED ON SAID HOUSING STRUCTURE IN OPERATIVE ENGAGEMENT WITH SAID FIRST MOTION-TRANSMITTING MEMBER FOR MOTION TRANSVERSELY THEREOF INTO CONTACTING ENGAGEMENT WITH THE INTERNAL WORKPIECE SURFACE, AN EXTERNAL SURFACE CONCENTRICITY FEELER MOVABLY MOUNTED ON SAID HOUSING STRUCTURE IN OPERATIVE ENGAGEMENT WITH SAID SECOND MOTION-TRANSMITTING MEMBER FOR MOTION TRANSVERSELY INWARD THEREOF INTO CONTACTING ENGAGEMENT WITH THE EXTERNAL ANNULAR WORKPIECE SURFACE, MEANS INTERCONNECTING SAID FIRST AND SECOND FEELERS WITH SAID FIRST AND SECOND MOTION-TRANSMITTING MEMBERS FOR CONVERTING THE TRANSVERSE MOTION OF SAID FEELERS INTO LONGITUDINAL MOTION OF SAID MOTION-TRANSMITTING MEMBERS, AND A PERPENDICULAR SURFACE-CONTACTING FEELER PORTION ON SAID THIRD MOTION-TRANSMITTING MEMBER ENGAGEABLE WITH SAID EXTERNAL PERPENDICULAR SURFACE.