Automatic pitch control system

Claim 1

A PITCH ANGLE CONTROL SYSTEM FOR NAVIGABLE CRAFT INCLUDING SERVO MEANS OPERABLE TO CHANGE THE ELEVATION OF THE CRAFT HAVING A SYNCHRO WITH A REPEATBACK OUTPUT; A DISPLAY PANEL HAVING A PITCH ANGLE INDICATOR WITH RELATIVELY MOVABLE SCALE AND POINTER PARTS, AN ELEVATION INDICATOR WITH RELATIVELY MOVABLE SCALE AND POINTER PARTS, AND A MOVABLE ELEMENT WITH A PART READABLE ON THE PITCH ANGLE INDICATOR AND A PART READABLE ON THE ELEVATION INDICATOR; MEANS FOR ORDERING A PITCH ANGLE INPUT TO SAID SERVO MEANS INCLUDING A MANUALLY MOVABLE MEMBER CONNECTED TO THE MOVABLE PART OF THE PITCH ANGLE INDICATOR, AND A SYNCHRO CONNECTED TO THE MEMBER PROVIDING AN OUTPUT DEPENDING ON THE MOVEMENT OF THE MEMBER FROM A NULL POSITION; MEANS INCLUDING A VERTICAL REFERENCE PROVIDING AN OUTPUT TO THE SERVO MEANS IN ACCORDANCE WITH THE PITCH TILT ANGLE OF THE CRAFT, MEANS PROVIDING AN OUTPUT TO THE SERVO MEANS IN ACCORDANCE WITH THE RATE OF CHANGE OF THE PITCH TILT ANGLE OF THE CRAFT, AND MEANS RESPONSIVE TO THE OUTPUT OF SAID PITCH TILT OUTPUT MEANS OPERATIVELY CONNECTED TO THE MOVABLE ELEMENT OF THE DISPLAY PANEL TO MOVE THE PART THEREOF READABLE ON THE PITCH INDICATOR TO COMPARE ACTUAL AND ORDERED CRAFT PITCH AND MOVE THE PART THEREOF READABLE ON THE ELEVATION INDICATOR TO INDICATE THE PULL-OUT ELEVATION ON THE ELEVATION INDICATOR.