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In translated form this paper is slightly shorter than the German original but I believe, nevertheless, that it retains all major facets which the author has painstakingly set out for the edification and interest of engineers and operatives who have any practical dealings with big gear drives of the open‐girth type. Herr Wollhofen draws skillfully on his expertise as Senior Engineer of Lubrication Engineering Headquarters of Klüber Lubrication München KG, and on his experience of special grease blending for girth‐gear installations in the hostile environment inseparable from cement kiln plant and mills where application of lubricants is by the adhesive spray system. We endorse his repeated emphasis on the fact that, to ensure best performance from such machinery and equipment, there is onus not only on the grease manufacturer to perfect his product, and on the service personnel to do their jobs properly, but also on the installer of the plant and its manufacturer and designer. The author's powerful plea that there must be better and closer liaison and co‐operation between all these factions may seem like crying for the moon. But when the resultant saving in time lost on repairs, and possibly capital outlay on premature replacements, is totted up, it is seen that Wollhofen's commonsense thesis has much to commend it.

TOOTH flank wear shown by waviness happens when the protective surface oxidation is impaired and the yield point of the metals is exceeded under relatively light loads. Seizure points are few, but cover a large area; worn‐off particles are correspondingly large and adhesive wear is severe.

IN A bid to widen familiarity among EEC industrialists with headway made in development of a graphite‐based greasing system for open girth gears—notably with application to cement kilns and ball mills—Klber, of Munich, West Germany, recently staged a colloquium for an invited study group. It is of some significance that Munich is adjacent to that Germanic part of Central Europe most productive of raw material especially suitable for graphite grease manufacture.