Liquid development fountain

A liquid development system for marking a record member moving in one direction and bearing a latent image, including means for storing liquid developer, fountain means having an inlet and an outlet, supply means connecting said storing means with said inlet, return means connecting said outlet with said storing means, the liquid developer flowing through said fountain from said inlet to said outlet generally in said one direction, said development system being characterized by said fountain means comprising

• an upper surface for guiding said record member for movement thereagainst,
• a development zone defined by a plurality of openings in said upper surface in the form of spaced, substantially parallel slots in said upper surface communicating with the interior of said fountain, said slots extending transversely to said one direction, and
• internal baffle means positioned to define a sinusoidal passageway extending from said inlet to said outlet through the interior of said fountain for directing the liquid developer to repetitively contact said record member through said slots.