FIG. F.-30 min. at 750°C. PLATE VII.-CARTRIDGE METAL (COPPER, 70.16; IRON, 0.06 PER CENT.; LEAD, TRACE). EFFECT OF ANNEAL AFTER 8 PER CENT. REDUCTION BY ROLLING. ORIGINAL STRIP ANNEALED 20 MIN. AT 800°C. BEFORE REDUCTION. ETCHED WITH AMMONIA AND HYDROGEN PEROXIDE. X 85.

FIG. E.-30 min. at 650°C.

FIG. F.-30 min. at 750°C. PLATE VIII.-CARTRIDGE METAL (COPPER, 70.16; IRON, 0.06 PER CENT.; LEAD, TRACE). EFFECT OF ANNEAL AFTER 12 PER CENT. REDUCTION BY ROLLING. ORIGINAL STRIP ANNEALED 20 MIN. AT 800°C. BEFORE REDUCTION. ETCHED WITH AMMONIA AND HYDROGEN PEROXIDE. X 85.

FIG. F.-30 min. at 750°C. PLATE IX.-CARTRIDGE METAL (COPPER 70.16; IRON, 0.06 PER CENT.; LEAD, TRACE). EFFECT OF ANNEAL AFTER 15 PER CENT. REDUCTION BY ROLLING. ORIGINAL STRIP ANNEALED 20 MIN. AT 800°C. BEFORE REDUCTION. ETCHED WITH AMMONIA AND HYDROGEN PEROXIDE. X 85.

PLATE X.-CARTRIDGE METAL (COPPER, 70.16; IRON, 0.06 PER CENT.; LEAD, TRACE). EFFECT OF ANNEAL AFTER 23 PER CENT REDUCTION BY ROLLING. ORIGINAL STRIP ANNEALED 20 MIN. at 800°C. BEFORE REDUCTION. ETCHED WITH AMMONIA AND HYDROGEN PEROXIDE.

X 85.

PLATE XI.-ALPHA BRASS (COPPER, 66.65; IRON, 0.08; LEAD, 0.30 PER CENT.). EFFECT OF ANNEAL AFTER 50 PER CENT. REDUCTION BY ROLLING. ORIGINAL STRIP ANNEALED SOFT IN THE MILL BEFORE REDUCTION. ETCHED WITH AMMONIA AND HYDROGEN PEROXIDE. X 85.