Anti-aircraft sighting device

Claim 1

AN ANTI-AIRCRAFT SIGHTING DEVICE COMPRISING, IN COMBINATION: A SIGHT LAYABLE IN AZIMUTH AND ELEVATION FOR DETERMINING THE DIRECTION TO A TARGET, AN AUTOMATIC TARGET TRACKING EQUIPMENT FOR MEASURING THE RANGE TO THE TARGET AND FOR GENERATING ERROR SIGNALS REPRESENTING THE AZIMUTH ANGULAR DEVIATION AND THE ELEVATION ANGULAR DEVIATION BETWEEN THE DIRECTION OF THE SIGHT AND THE DIRECTION OF THE TARGET AND THE DEVIATION BETWEEN THE RANGE PRESENTLY SET IN SAID TRACKING EQUIPMENT AND THE RANGE TO THE TARGET, SERVOMOTORS CONTROLLED BY SAID ERROR SIGNALS FOR LAYING SAID SIGHT IN AZIMUTH AND ELEVATION AND FOR SETTING THE RANGE IN SAID TRACKING EQUIPMENT, MEANS ASSOCIATED WITH THE SIGHT AND THE TRACKING EQUIPMENT FOR PRODUCING TARGET DATA SIGNALS REPRESENTING THE AZIMUTH ANGLE, THE ELEVATION ANGLE, AND THE RANGE TO THE TARGET AND THE AZIMUTH ANGULAR VELOCITY, THE ELEVATION ANGULAR VELOCITY AND THE RANGE VELOCITY OF THE TARGET IN RELATION TO THE SITE OF THE SIGHT, AN ELECTRIC COMPUTER SUPPLIED WITH SAID TARGET DATA AND ARRANGED TO COMPUTE ON THE BASIS OF SAID DATA AND THE ASSUMPTION THAT THE TARGET IS MOVING IN A STRAIGHT COURSE WITH A VARIABLE VELOCITY, THE AZIMUTH ANGULAR ACCELERATION AND THE ELEVATION ANGULAR ACCELERATION OF SAID TARGET AND TO PRODUCE SIGNALS PROPORTIONAL TO SAID COMPUTED AZIMUTH ANGULAR ACCELERATION AND SAID COMPUTED ELEVATION ANGULAR ACCELERATION RESPECTIVELY, SAID SIGNALS BEING CONNECTED TO THE SERVOMOTOR LAYING SAID SIGHT IN AZIMUTH AND THE SERVOMOTOR LAYING SAID SIGHT IN ELEVATION RESPECTIVELY AS REGENERATIVE CONTROL SIGNALS FOR SAID SERVOMOTORS.