Abstract: A system for measuring the state of charge of a storage battery is disclosed which corrects charging and discharge electrical quantities of the battery in view of temperature and charging efficiency of the battery, and the like to precisely measure the state of charge thereof by digital-operation. There is also disclosed a system correcting, by digital-operation, the variation in capacity of the battery due to the variation in life of the battery and/or the self-discharge thereof as well, to thereby measure the state of charge with higher precision.

Abstract: A television camera employing a dichroic mirror light-splitting system and a supplementary light arrangement for introducing an external light beam into the dichroic mirror when the camera is initially to be adjusted with respect to pattern registration, color balance and color temperature compensation. As the dichroic mirror is selectively receptive of the light beams from the television camera lens and the light arrangement, when the external light beam is allowed to enter the dichroic mirror, the resulting outputs of three color component image pick-up tubes are electrically processed according to a predetermined program to effect automatic adjustment of the TV-camera.