The modern large type steam turbine may have thousands of gallons of lubricating oil in its circulation system but the role of this lubricant may well be one‐tenth lubricant and nine‐tenths coolant. In addition to lubricating and cooling, this oil must act as a hydraulic medium for operation of the governor gear and as a sealing medium in the case of the modern hydrogen cooled units. The importance of using the correct oils, particularly in view of the new power stations that are due for erection in this country, and the need for ensuring thorough maintenance of the lubricating systems were stressed by Dr. W. E. J. Broom, B.Sc, Ph. D., and Mr. G. H. Clark, M.I.Mar.E., of the Anglo‐American Oil Co. Ltd., in a paper recently presented to the Northern Branch of the Institute of Petroleum.
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