Abstract: Describes is a battery booster for jumpstarting a vehicle having an external battery. The battery booster comprising a set of electrical conductors, a power supply configured to supply a starting current to jump start the vehicle via the set of electrical conductors, a boost switch positioned in-line between the power supply and a set of battery clamps on one of the set of electrical conductors; and at least one processor configured to output a control signal to close the boost switch as a function of one or more parameters of the power supply, the external battery, or the vehicle. The set of electrical conductors are configured to couple with the external battery or with an engine that is electrically coupled with the external battery via the set of battery clamps. The set of electrical conductors comprises a positive electrical conductor and a negative electrical conductor.

Abstract: Optical aim-training apparatus 10 (FIG. 1) for a rifle 20, or the like comprises a CRT displaying a target image on a scanned line raster. The rifle is simulated and has photo-detection device 21 contained in a housing 22 located adjacent the barrel 19. The photodetection device has a detection axis 23, aligned parallel with the rifle bore axis, which 23 intersects the screen at detection point 34. The rifle sighting device has a sightline also parallel to the bore axis and detection axis intersecting the screen at aim point 33. The offset between aim and detection points is determined by a calibration procedure and when aim is taken at a target image and the trigger depressed a marker region of raster 29, displaced from the image by the calibration offset, is brightened temporarily. A series of light pulses due to scanning of the marker region raster is detected and the screen location of the center of the detector field of view i.e. detection point 34, found.