IN a recently published paper, Stewart, discusses various problems of engine maintenance policy as adopted for U.S. Navy vehicles. He analyses the costs of direct labour involved under three headings:

GREASE has many advantages as a ball and roller bearing lubricant. For example, it is easily retained in the bearing housing, can be used at quite high rotational speeds without leaking and also acts as a protective coating against corrosive attack. The latter naturally depends on the quality of the grease but this article only considers products of repute.

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Non‐Soap Thickened Greases During the same period in which synthetic fluids were produced and quite widely used in lubricating greases—roughly over the last twenty‐five years—chemists also explored the field of non‐soap thickeners. The result of this work has been the successful production of certain types on a commercial scale, and this type of material has undoubtedly provided lubricants of a special nature which find considerable application, particularly under conditions involving high temperature.

A series of articles dealing, in as simple a way as possible, with the basic facts of lubrication, lubricants, their selection and prescription, specification, application, and testing. This series is primarily intended for students, engineering personnel who may be unfamiliar with certain aspects and others who, one way or another, are interested in this important subject.