Surface Films in View. Studying surface films on metals optically, as the subject of a lecture, might at first seem of academic interest, but its origin is well rooted in good craftsmanship; the old‐time blacksmith or toolmaker judged the heat treatment temperature of his products by the rate of spread of interference colours across a freshly filed surface. Between the visual assessment of colours and the modern use of a polarising spectrometer lies a mass of optical theory which has deterred many a research chemist. However, Prof. A. B. Winter‐bottom of the Technical University, Trondheim, Norway, was not deterred from covering this subject in the eagerly awaited spring lecture of the S.C.I. Corrosion Group.
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