CU of sand casting being tested in template, pressure causing mould to crack. DOLLY SHOT along table of woman weighing clay, of man mixing water with samples, of other man making briquettes. FOLLOW SHOT of man carrying tray of briquettes over to drying oven. MS of man turning handle operating elevator, other man guiding extruded section into furnace in electrolysis laboratory. CU of hands removing cast from mould, breaking sand using chisel and hammer. MS of geologist examining rock samples, sorting them in bin, throwing some in smelting furnace, HACS of sample melting in furnace.