Year-Long Evaluation of Trucks and Buses Equipped with Passive Diesel Particulate Filters

A development apparatus in which the donor member has a pattern of depressed regions therein. The donor member moves developer material into contact with a sheet of support material disposed adjacent an electrostatic latent image recorded on a photoconductive surface. Inasmuch as the donor member has a pattern of depressed regions therein, the developer material is deposited on the sheet of support material in a half-tone pattern.