Gauging linear dimensions

Claim 1

MEASURING APPARATUS FOR MEASURING THE DISTANCE BETWEEN A DATUM SURFACE OF A SET OF SURFACES AND EACH OF THE REMAINING SURFACES OF THE SET, THERE BEING A PLURALITY OF SUCH SETS ON A RIGID ROTATABLE ASSEMBLY, COMPRISING A SUPPORT STRUCTURE CAPABLE OF SUPPORTING THE SAID ASSEMBLY; AN INDEXING MECHANISM ADJACENT THE SUPPORT STRUCTURE TO MOVE THE ASSEMBLY FROM A POSITION FOR MEASURING ONE SET OF SURFACES TO A POSITION FOR MEASURING ANOTHER SET OF SURFACES INCLUDING A DISC MOUNTED COAXIALLY AND FAST WITH THE RIGID ROTATABLE ASSEMBLY AND HAVING A PLURALITY OF NOTCHES CORRESPONDING IN NUMBER AND SPACING TO THE SETS OF SURFACES, AND AN INDEXING FINGER WHICH ENGAGES EACH OF THE SAID NOTCHES IN SUCCESSION TO HOLD THE RIGID ASSEMBLY IN A MEASURING POSITION, A LOCKING LEVER WHICH ENGAGES A NOTCH OF THE DISC WHENEVER THE INDEXING FINGER IS DISENGAGED FROM THE DISC, LEVER MEANS OPERABLE TO MOVE THE LOCKING LEVER AND A LINKAGE OPERABLE BY THE LEVER MEANS TO EFFECT DISENGAGEMENT OF THE INDEXING FINGER; MEASURING EQUIPMENT INCLUDING A DATUM SURFACE ENGAGING MEMBER, A NUMBER OF SURFACE ENGAGING MEMBERS CORRESPONDING TO THE REMAINING SURFACES OF EACH SET, MEANS TO BRING EACH OF THE SURFACE ENGAGING MEMBERS INTO SUCCESSIVE ENGAGEMENT WITH THE CORRESPONDING SURFACE, MEANS TO MEASURE THE DISPLACEMENT OF EACH OF THE SURFACE ENGAGING MEMBERS IN SUCCESSION RELATIVELY TO THE DATUM SURFACE ENGAGING MEMBER, AND DRIVING MEANS TO ACTUATE THE MEASURING EQUIPMENT; MEANS TO ACTUATE THE INDEXING MECHANISM; AND MEANS TO SYNCHRONISE OPERATION OF THE MEASURING EQUIPMENT AND THE INDEXING MECHANISM WHEREBY ON COMPLETION OF THE MEASUREMENT OF ONE SET OF SURFACES BY THE MEASURING EQUIPMENT, THE OPERATION OF THE MEASURING EQUIPMENT IS STOPPED AND ON COMPLETION OF THE INDEXING MOVEMENT OF THE RIGID ROTATABLE ASSEMBLY BY THE INDEXING MECHANISM THE OPERATION OF THE MEASURING EQUIPMENT IS RECOMMENCED.