Time interval computer

Claim 1

A COMPUTER SYSTEM FOR DETERMINING THE TIME INTERVAL BETWEEN FILM EXPOSURES NECESSARY TO OBTAIN SUFFICIENT AND CONSTANT OVERLAP OF PHOTOGRAPHIC FRAMES IN AN AERIAL CAMERA FOR USE BY A RECONNAISSANCE AIRCRAFT, COMPRISING IN COMBINATION: DOPPLER RADAR MEANS PROVIDING AN OUTPUT SIGNAL PROPORTIONAL TO AIRCRAFT VELOCITY IN THE HEADING DIRECTION, FIRST SHAFT MEANS, FIRST SERVO MEANS CONNECTED BETWEEN SAID DOPPLER RADAR MEANS AND SAID FIRST SHAFT MEANS CONVERTING SAID OUTPUT SIGNAL PROPORTIONAL TO AIRCRAFT VELOCITY INTO A DISPLACEMENT OF SAID FIRST SHAFT MEANS, RADAR ALTIMETER MEANS PROVIDING AN OUTPUT SIGNAL PROPORTIONAL TO AIRCRAFT ALTITUDE, SECOND SHAFT MEANS, SECOND SERVO MEANS CONNECTED BETWEEN SAID RADAR ALTIMETER MEANS AND SAID SECOND SHAFT MEANS CONVERTING SAID OUTPUT SIGNAL PROPORTIONAL TO AIRCRAFT ALTITUDE INTO A LINEARLY PROPORTIONAL DISPLACEMENT OF SAID SECOND SHAFT MEANS, AN ELECTROMECHANICAL COMPUTER COUPLED TO SAID FIRST AND SECOND SHAFT MEANS, MEANS INCLUDED IN SAID ELECTROMECHANICAL COMPUTER FOR COMPARING THE RESPECTIVE DISPLACEMENTS OF SAID FIRST AND SECOND SHAFT MEANS TO PROVIDE AN OUTPUT PROPORTIONAL TO THE RATIO OF AIRCRAFT VELOCITY TO AIRCRAFT ALTITUDE, CAMERA CONTROL MEANS, CONNECTING MEANS COUPLING THE OUTPUT OF SAID ELECTROMECHANICAL COMPUTER TO SAID CAMERA CONTROL MEANS WHEREBY SAID CAMERA CONTROL MEANS IS PROVIDED WITH AN INPUT PROPORTIONAL TO THE NECESSARY INTERVAL BETWEEN FILM EXPOSURES.