CS of hammer breaking limestone sample, DOLLY OUT to man breaking sample in laboratory, other man at work in background. MCS of man examining mineral content of potash sulphide at desk. CU of wheel of truck spinning in mud, driver getting out to examine mud. Shot of man feeding zinc sheet billets into furnace. HAMLS of men at work in experimental foundry. CUs of man insering metal samples in slit pockets of centrifuge. CS of metal samples being immersed in liquid in beakers on shelf in laboratory for rust erosion tests. CU of briquette beginning to crack in Amsler compressive testing apparatus.