Abstract: An improved ballistic impact sensing and display system is provided for use in conjunction with land or water ordnance ranges. A plurality of sensors placed around the target area detect the shock wave created by the impact or passage of the ballistic projectile. The sensors drive electronic timing means which record the time intervals between activation of the sensors by the propagating shock wave. Storage registers within the timing means drive a gridwork of display buses arranged along hyperbolic curves. A matrix of indicators bridging the points of intersection of the hyperbolic buses display the compartment within the target area in which the impact occurred. Additional indicators around the periphery of the matrix of indicators display the sector by which a projectile passed if it missed the target area.

Abstract: A system is provided for multistation remote position indication for remotely controlling and indicating the position of a motor driven positioning system, particularly an antenna rotor, at multiple locations utilizing a single pair of control wires to interconnect all remote control units. The system includes the generation of a symmetrical alternating polarity low frequency pulse train which is amplitude modulated by the position of the antenna, display of the antenna position by means of a polarity selective peak detecting voltmeter, and control of the antenna position by means of polarity selective current means through a synchronous detector and antenna drive motor control means.

Abstract: Effective shutter speed, focal plane exposure and film transport frame rate measurements are taken and displayed in user oriented format by a computing method and system for testing still and cinematic cameras. An analog signal pulse is generated that is responsive to the illuminance admitted to the camera focal plane during each camera shutter operation. Comparison of the analog signal pulse with various voltage threshold levels provides pulse period, overrange and underrange information. Cinematic frame rate is determined by dividing units by the time period, in seconds, between the beginnings of successive analog signal pulses; effective shutter speed is determined by dividing the peak amplitude value by the integrated value of the analog signal pulse; and focal plane exposure speed is determined by dividing the camera calibration constants by the integrated value of the analog signal pulse.

Abstract: A camera shutter tester that automatically displays a standard shutter speed nearest to the actual speed of the shutter being tested and displays a ratio of that speed to the standard speed. A photodetector is placed in the focal plane of the camera that faces a light source and the photodetector's output is threshold detected and a logic circuit generates an initialization pulse. A voltage controlled oscillator dependent upon the photodetector's output feeds a countdown shift register that is in turn fed by a range shift register which also feeds range information to a ratio counter. The initialization pulse activates the range shift register, the countdown register, and the ratio counter. The frequency of the voltage controlled oscillator is divided by the output of the countdown shift register and the new frequency is fed to the ratio counter which in turn delivers a range change pulse to the range shift register.