LEAD. By J. A. Smythe, D.Sc.
ENGRAVING. By T. W. Lascelles
STONES AND QUARRIES. By J. Allen Howe, O.B.E., B.Sc.
EXPLOSIVES. By S. I. Levy, B.Sc.
THE CLOTHING INDUSTRY. By B. W. Poole, M.U.K.A.
TELEGRAPHY, TELEPHONY, AND WIRELESS. By J. Poole
PERFUMERY. By E. J. Parry
THE ELECTRIC LAMP INDUSTRY. By G. Arncliffe Percival
ICE AND COLD STORAGE. By B. H. Springett
GLOVES AND THE GLOVE TRADE. By B. E. Ellis