The paper outlines the design requirements and constantly arbitrary heat scale the change in the amount of heat increasing demandr, particularly in respect ofsurface speed, placed that it has been found necessary to dissipate from selfupon self-contained vertical bearings. TWO bpes of bearing in contained verticals. Overall from these figures, it has present-doy use are desuibed and the limitationr, inherent in been concluded that the requirement is for self-contained bearings to cover the 4 pole speed in the immediate design, upon performance discussed.future while making provision for 2 pole speeds. Overall Test work on several sizes of bearing is described and compari-sizes need to be kept as low as possible, while at the same sons made. Data on babbitt temperature are given and, following time dissipating considerably more heat than in the past. discussion as to the limits to be placed upon babbitt temperature Two basic designs of vertical thrust bearings are in and stress as well as comparison between theoretical prediction and current usage, these being shown in ~i~. 2. ~~~h comprise measured values, graphs to a load and speed bask are given of a thrust collar secured to the rotating shaft, thrust showing the present limits of operation of these bearings.

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