On the Experiment of electrophotographic Development

Abstract

Recent experiment on electrophotographic development is described, with emphasis on high resolution development and the relationship of initial paper potentials to powder image density. The magnetic brush consists of powdered iron (300-1000 mesh granular particles) mixed with very fine toner Particles.
The, toner was produced by spray drying the solution of raw materials and collecting in a electrostatic precipitator. The resulting image has a resolution of about 120lines/millimeter on the electrophotographic papers.
The powder image density was measured on three kind of papers printed in contact to a half tone positive or enlarged from a transparent gray scale.