Self diffusion of a tagged particle in equilibrium for asymmetric mean zero random walks with simple

An on-the-fly printer having a continuously rotating drum including multiple side-by-side columns of characters, and having multiple spring-energized acceleration and print impact mechanisms associated with the respective character columns, the acceleration and impact mechanism being mechanically restored to, and latched in, energy-stored positions from which they can be selectively released each to drive a separate hammer against paper and/or paper forms inserted between the mechanism and the character drum, the release being accomplished by electronic control circuitry operative to determine when the angular position of the drum is correct and thereupon to print characters located in that row of the drum in one or more of the digit positions corresponding with the various columns of print, the electronic control circuitry subsequently enabling a restore mechanism to retract and latch all of the acceleration and impact mechanisms as soon as a row or line of digit positions has been printed, the printer automatically advancing paper tapes as well as manually inserted forms to the next print position during each operation of the restore mechanism.