Abstract: A method and apparatus for monitoring the corrosion of a working electrode. An alternating perturbation signal of at least one frequency is applied to the working electrode. A signal representing the response of the working electrode to the applied perturbation signal is monitored. The monitored signal is filtered to separate out a signal representing the response of the electrode to the or each applied frequency and an electrochemical noise output signal representative of corrosion of the working electrode. The potential of the working electrode relative to a reference electrode may be controlled by controlling the supply of current through an auxiliary electrode. The supplied current is then monitored and the monitored current is filtered. Alternatively, a known alternating current may be applied between the working electrode and an auxiliary electrode and fluctuations in the potential of the working electrode relative to a reference electrode may be monitored, the monitored potential being filtered.

Abstract: An apparatus for use in a firing range, in which transducers located adjacent the target area detect the airborne shock wave from supersonic projectiles. The position at which each projectile passes through the target plane is determined from the relative time of arrival of the associated shock wave at the transducers. A visual display of the target and the projectile position is provided for the use of range personnel.

Abstract: An apparatus for use in a firing range, in which transducers located adjacent the target area detect the airborne shock wave from supersonic projectiles. The position at which each projectile passes through the target plane is determined from the relative time of arrival of the associated shock wave at the transducers. A visual display of the target and the projectile position is provided for the use of range personnel.

Abstract: A target material comprises a rubber sheet coated with a thermoluminescent material. When a bullet penetrates the target, as a result of the temperature rise the thermoluminescent material thermoluminesces indicating where the bullet went. A range is disclosed in which images of targets are projected onto the target material.

Abstract: An apparatus for use in a firing range, in which transducers located adjacent the target area detect the airborne shock wave from supersonic projectiles. The position at which each projectile passes through the target plane is determined from the relative time of arrival of the associated shock wave at the transducers. A visual display of the target and the projectile position is provided for the use of range personnel.

Abstract: An apparatus for use in a firing range, in which transducers located adjacent the target area detect the airborne shock wave from supersonic projectiles. The position at which each projectile passes through the target plane is determined from the relative time of arrival of the associated shock wave at the transducers. A visual display of the target and the projectile position is provided for the use of range personnel.