Developing tank unit for electrostatic printing

Claim 1

IN A LIQUID DEVELOPER STATION FOR IMMERSING A PHOTOGRAPHIC CARRIER HAVING AN ELECTROSTATIC LATENT IMAGE AT ONE SURFACE THEREOF COMPRISING A TANK OF NON-CONDUCTING MATERIAL SERVING AS A RESERVOIR FOR A LIQUID DEVELOPER HAVING ELECTROSTATICALLY ATTRACTABLE PIGMENT PARTICLES THEREIN; CARRIER INGRESS MEANS ADJACENT ONE END OF SAID TANK; CARRIER EGRESS MEANS ADJACENT ANOTHER END OF SAID TANK; AND GUIDE MEANS ON SAID TANK TO GUIDE SAID CARRIER THROUGH SAID LIQUID DEVELOPER AT A POSITION BETWEEN SAID INGRESS AND EGRESS MEANS; THE IMPROVEMENT CONSISTING OF AN INTENSIFIER MEMBER OF CONDUCTIVE MATERIAL POSITIONED ALONG THE PATH OF THE CARRIER AT THE POSITION WHERE THE CARRIER IS IMMERSED IN SAID LIQUID, AND MEANS FOR SPACING SAID INTENSIFIER MEMBER OUT OF RUBBING CONTACT WITH, BUT CLOSELY TO THE SURFACE OF THE ELECTROSTATIC IMAGE ON THE CARRIER, SAID INTENSIFIER MEMBER BEING FREE OF ANY BIAS VOLTAGE.