Pumps using mercury, n-butyl phthalate, and Apiezon oil have been tested for effectiveness against various fore pressures. Special designs have been worked out for use with Apiezon oil

Pinney, L. E.

English

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Operating Characteristics of Vapor-Type Vacuum Pumps

University of Northern Iowa

Proceedings of the Iowa Academy of Science Volume 42 Annual Issue Article 73 1935 Operating Characteristics of Vapor-Type Vacuum Pumps L. E. Pinney Iowa State College Copyright ©1935 Iowa Academy of Science, Inc. Follow this and additional works at: https://scholarworks.uni.edu/pias Recommended Citation Pinney, L. E. (1935) "Operating Characteristics of Vapor-Type Vacuum Pumps," Proceedings of the Iowa Academy of Science, 42(1), 157-157. Available at: https://scholarworks.uni.edu/pias/vol42/iss1/73 This Research is brought to you for free and open access by the Iowa Academy of Science at UNI ScholarWorks. It has been accepted for inclusion in Proceedings of the Iowa Academy of Science by an authorized editor of UNI ScholarWorks. For more information, please contact scholarworks@uni.edu. 1935] ABSTRACTS 157 Large groups of students have been used whose physics intelligence coefficients were known. Part o [ the group has Leen used to hear the lecture while the rest were writing an examination over laboratory work in another part of the building. The results are very disquieting for those who have deep faith in the lecture method. DF:rAR'rMI~Kr oF PnYsics, SrATE UNIVERSI'rY oF IowA, IowA CITY, IowA. OPERATING CHARACTERISTICS OF VAPOR-TYPE VACUUM PUMPS L. E. PINNEY Pumps using mercury, n-butyl phthalatc, and Apiezon oil have been tested for effectiveness against various fore pressures. Special designs have been worked out for use with Apiezon oil. DF.PARTMF,N1' OF PHYSICS, IowA STA'TE COLLEGE, AMES, IowA. PHOTOCELLS FOR LABORATOI<.Y USE L. E. PINNEY Cells having various types of composite coatings have been pre-pared. Particular attention has been given to better insulation and greater stability than is found in commercial cells. DBPARTMl\NT OF PHYSJCS, IowA STATE Cm.LEGE, AMES, IowA. 1Pinney: Operating Characteristics of Vapor-Type Vacuum PumpsPublished by UNI ScholarWorks, 1935

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Operating Characteristics of Vapor-Type Vacuum Pumps

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University of Northern Iowa