we must use much broader concepts in preparing for future lubrication requirements than at any time in the past. Temperature requirements provide the best example. About 1930, -65°F. was considered to be the low temperature goal, and the progression of the upper temperature goal from about 165°F. in that same year to about 200°F. in 1945 was gradual, and our research seemed adequate.But with the advent of jet propulsion systems and now of space systems the known state-of-the-art covers a much smaller fraction of our needs. The environments in which lubricants must operate have been greatly extended. Environmental temperatures now range from about -450°F. to temperatures in excess of 2500°F ., while pressures now extend from atmospheric down to beyond 10-10 mm. of Hg, Long duration capability or operation is needed-operational life of aerospace systems will be expected to exceed 30,000 hours. These new
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