Aircraft instrument for the control of an air-intake of avriable shape for a supersonic engine

Claim 1

AN AIRCRAFT INSTRUMENT FOR CHECKING THE POSITIONS OF DISPLACEABLE MEMBERS ADAPTED TO VARY THE SHAPE OF THE AIRINTAKE OF A SUPERSONIC AIRCRAFT ENGINE IN DEPENDENCE ON THE SPEED OF THE AIRCRAFT, SAID AIR-INTAKE COMPRISING TWO SAID DISPLACEABLE MEMBERS, A LOWER LIP AND AN UPPER PROFILE, SAID LOWER LIP PASSING FROM A LOW POSITION TO A HIGH POSITION WHEN THE FLIGHT MACH NUMBER PASSES FROM 0 TO 0.8 AND RETURNING TO ITS LOW POSITION WHEN THE MACH NUMBER PASES FROM 1.7 TO ITS MAXIMUM ADAPTATION VALUE, WHILE SAID UPPER PROFILE PASSES FROM ITS HIGH POSITION TO A LOW POSITION WHEN THE MACH NUMBER PASSES FROM 1.5 TO ITS MAXIMUM VALUE, SAID INSTRUMENT COMPRISING ESSENTIALLY A GRADUATE MACHMETER DIAL, AN OUTER POINTER MOVING ALONG THE GRADUATIONS OF SAID DIAL, AND AT LEAST TWO NEEDLES ADAPTED TO MOVE OVER SAID DIAL, MEANS FOR ACTUATING A FIRST OF SAID NEEDLES IN DEPENDENCE ON THE DISPLACEMENTS OF SAID LOWER LIP SO THAT ITS POSITION ON SAID GRADUATIONS IS EXACTLY OPPOSITE THAT OF SAID POINTER WHEN THE MACH NUMBER PASSES FROM 0 TO 0.8, MEANS FOR ACTUATING A SECOND OF SAID NEEDLES IN DEPENDENCE ON THE DISPLACEMENTS OF SAID UPPER PROFILE SO THAT ITS POSITION ON SAID DIAL GRADUATIONS IS EXACTLY OPPOSITE THAT OF SAID POINTER WHEN THE MACH NUMBER PASSES FROM 1.5 TO ITS MAXIMUM VALUE, SAID FIRST MEANS ALSO ACTUATING SAID FIRST NEEDLE TO MOVE IT IN THE OPPOSITE DIRECTION, INDEPENDENTLY OF SAID POINTER, OVER THE GRADUATIONS OF SAID DIAL BETWEEN 0.8 AND 0.