Ion exchange in the atomic energy program. Instrumentation in chemical plants. Trends in design of cyclotrons and three other articles in the nuclear technology field. Recent developments in cellulose lacquers. Levulinic acid as a chemical raw material. Superfine plastic fibers. Continuous reduction of phthalic acid. COLUMNS: Equipment and Design, Instrumentation, Corrosion, Industrial Wastes, Materials Handling, beginning.