Abstract: In an ink jet nozzle per spot printer, the transit time of each stream is measured on a periodic basis. In response to the measured transit times, the time at which information imparting signals are applied to the respective charge electrodes is controlled. The transit time is measured (counted) in units of a drop cycle. The slowest count is detected, and the difference is taken between the transit time of the slowest stream and all other streams. In the instance when there is a transit time difference of zero between the slowest stream and a given stream, the printing signal is provided to the charge electrode without delay. In the instances when a transit time difference is detected, an information imparting signal is applied to the charge electrode with a delay dependent upon the sensed transit time difference. A data register has information signals stored therein which are indicative of the data to be printed. Such data will be printed during an appropriate portion of a data cycle.